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GB Trade Standards of the People's Republic of China 中华人民共和国国家标准 ���� ���� ����� ��������
Quality Carbon Car bon Structural Steels Steels
优 质 碳 素 结 构 钢
Issued on 1 Nov. Nov. 1999
Executed since 1 Aug. 2000
1999-11-01 发布 发布
2000-08-01 实施 实施
ISSUED BY THE STATE STATE BUREAU OF QUALITY TECHNICAL SUPERVISION
国家质量技术监督局 发布
1
BUREAU
GB/T 699-1999
Foreword This standard is a revision on GB/T 699-1998 "Specifications for Quality Carbon Structural Steels". The current revision of this standard has made modifications in respect of the following items: The name of standard is changed to "Quality carbon structural steels"; The applicable scope is extended to such extent that quality carbon structural steels with diameter or thickness greater than 250mm may be supplied; The chapter of "Order Information" is added; Th size, dimensions and allowance shall be in accordance with the stipulations in standard GB/T 702-1986 or GB/T 908-1987; Marking symbols of steel products and unified numerical representation for various designations are added; The range of carbon content for designations below 40 (with exception of 08F) is narrowed by 0.01%; The phosphorus and sulfur contents and macroscopic structure of steels are classified into three grades based on the metallurgical quality; For steels delivered in the hot-rolled or hot forged state, the mechanical properties may be exempted from inspection if the supplier can guarantee the conformance; In note 2 of Table 3, the quench cooling medium for designation 75, 80 and 85 steels is changed from "water cooling" to "oil cooling"; The "fracture" test is cancelled; The acceptable grading of non-metallic inclusions is cancelled. This standard shall replace GB/T 699-1988 "Specifications for Quality Carbon Structural Steels" since its implementation. 2
This standard is proposed by the State Bureau of Metallurgical Industry. This standard shall be under the jurisdiction of the National Technical Committee of Steel Standardization. This standard is prepared mainly by the Information Standard Institute of the Ministry of Metallurgical Industry, Chongqing Special Steel Co., Shanghai Pugang Group Corporation, Daye Special Steel Co., Ltd. and Handan Iron and Steel Corporation. Main draftsmen of this standard are: Luan Yan, Tang Yifan, Tang Zhibai, Chen Changxi, Sun Ping, Teng Changling, Zhao Gaunxin This standard was initially issued in January 1965 and revised for the first time in February 1988.
3
National Standard of the People's Republic of China GB/T 699-1999
Quality carbon structural steels Substitute for GB/T 699-1988
1
Scope
This standard defines the size, dimensions, weight and allowance, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of hot rolled or forged quality carbon structural steels. This standard is applicable to quality carbon structural steel bars with diameter or thickness not greater than 250mm. Those with diameter or thickness greater than 250mm may also be supplied as agreed between the buyer and the supplier. The designations and chemical composition as specified in this standard is also applicable to steel ingots, steel billets and their manufactures. 2
Normative References
Provisions from the following standards shall form part of this standard by being cited herein. At the time of publication of this standard, the revisions of these standards as shown are valid. All standards shall be subject to amendment and revision, and all users of this standard should probe into the possibility of applying the updated revisions of the following standards. GB/T 222-1984
Method for sampling of specimens for chemical analysis of steels and allowance for chemical composition of finished products
GB/T 224-1987
Method for decarburized layer depth test of steels
GB/T 226-1991
Method for acid attack test of macroscopic structure and imperfection of steels
GB/T 228-1997
Method for tensile test of metals
GB/T 229-1994
Metallic Material - Charpy notch impact test
GB/T 231-1984
Method for Brinnel hardness test of metals
GB/T 233-1982
Method for upsetting test of metals
GB/T 702-1986
Size, dimensions, weight and allowance of hot rolled round and square steels
Approved
by
the
State
Bureau
of
Quality
Technical Supervision on November 1, 1999
To be implemented as of August 1, 2000
4
GB/T 699
GB/T 908-1987
1999
Size, dimensions, weight and allowance of forged round and square steels
GB/T 1979-1980
Grading
diagrams
for
evaluation
of
macroscopic
structural
imperfections of structural steels GB/T 2101-1989
General stipulations on acceptance, packaging, markings and quality certificates of profile steels
GB/T 2975-1998
Steel and steel products - Location and preparation of test specimens for mechanical testing
GB/T 4336-1984
Method for photoelectric emission spectroscopic analysis of carbon steel, medium and low alloy steel
GB/T 6397-1986
Specimens for tensile test of metals
GB/T 7736-1987
Ultrasonic inspecting method for macro-structure and imperfection of steel
GB/T 10561-1989
Steel - Determination of content of non-metallic inclusion Micrographic method using standard diagrams
GB/T 17616-1998
Unified numbering system for designations of iron, steel and alloy
GB/T 13299-1991
Steel - Determination of microstructure
GB/T 15711-1995
Steel products - Methods for acid etch test of tower sample
GB/T 17505-1998
Steel and steel products - General technical delivery requirements
YB/T 5148-1993
Method for the test of mean grain fineness of metals
See Annex A (Annex to the Standard) for normative references for chemical analysis methods of various elements in steel. 3
Order Information
Contracts concluded or purchase orders placed in compliance with this standard should contain the following information a
Standard code number
b
Description of product
c
Designations or unified numerical code
d
Weight (quantity) of delivery 5
e
Class of accuracy for specification and size
f Processing method used g
State of delivery
h
Impact test (where required, as per 6.4.1)
i
Upsetting test (where required, as per 6.5)
j
Non-metallic inclusion (where required, as per 6.7)
k Decarburized layer (where required, as per 6.8) l
Special requirements (where required, as per 6.10) GB/T 699
4
1999
Classification and Code
4.1
Steel material is classified according to its metallurgical quality as follows:
Quality Steel Premium-grade Quality Steel
A
Special-grade Quality Steel
E
4.2 a)
Steel material is classified into two categories according to the processing method used: Steel for pressed work
UP
Steel for hot pressed work
UHP
Steel for upsetting work
UF
Steel for cold drawn billet
UCD
b) Steel for cutting work 5
UC
Size, Dimensions, Weight and Allowance
5.1
The size, dimensions and allowance of hot rolled round steels and square steels should
comply with relevant stipulations in GB/T 702. Specific requirements should be clearly stated in the contract. 5.2
The size, dimensions and allowance of forged round and square steels should comply
with relevant stipulations in GB/T 908. Specific requirements should be clearly stated in the contract. 6
5.3
The size, dimensions and allowance of steels with other cross-sections should comply
with relevant stipulations in corresponding standards. 6
Technical Requirements 6.1
Designation, Code and Chemical Composition
6.1.1
Designations, unified numerical code and chemical composition (smelting analysis) of
steels should comply with Table 1. 6.1.1.1
Sulfur and phosphorus contents of steels should comply with Table 2.
6.1.1.2
The allowable copper content of steels smelted with steel scrap should not be higher
than 0.30%. 6.1.1.3
The copper content of steels for hot pressed work should not be higher than 0.20%.
6.1.1.4
The manganese content of 35~38 steels for lead-bath quenched steel wires should be
0.30%~0.60%; the chromium content should not be higher than 0.10%, the nickel content should not be higher than 0.15%, the copper content should not be higher than 0.20%; the sulfur and phosphorus contents should comply with the requirements of steel wire standards. 6.1.1.5
For aluminum deoxidization smelted killed steel for 08 steels, the lower limit of
manganese content is 0.25%, the silicon content should not be higher than 0.03% and the aluminum content should be 0.02%~0.07%. In this case the designation of the steel is 08Al. GB/T 699
1999
Table 1 No.
Unified numerical code
Chemical composition Designation
C
Si
Mn
% Cr
Ni
Cu
Not higher than
1
U20080
08F
0.05~0.11
0.03
0.25~0.50
0.10
0.30
0.25
2
U20100
10F
0.07~0.13
0.07
0.25~0.50
0.15
0.30
0.25
3
U20150
15F
0.12~0.18
0.07
0.25~0.50
0.25
0.30
0.25
4
U20082
08
0.05~0.11
0.17~0.37
0.35~0.65
0.10
0.30
0.25
5
U20102
10
0.07~0.13
0.17~0.37
0.35~0.65
0.15
0.30
0.25
6
U20152
15
0.12~0.18
0.17~0.37
0.35~0.65
0.25
0.30
0.25
7
U20202
20
0.17~0.23
0.17~0.37
0.35~0.65
0.25
0.30
0.25
8
U20252
25
0.22~0.29
0.17~0.37
0.50~0.80
0.25
0.30
0.25
9
U20302
30
0.27~0.34
0.17~0.37
0.50~0.80
0.25
0.30
0.25
10
U20352
35
0.32~0.39
0.17~0.37
0.50~0.80
0.25
0.30
0.25
11
U20402
40
0.37~0.44
0.17~0.37
0.50~0.80
0.25
0.30
0.25
12
U20452
45
0.42~0.50
0.17~0.37
0.50~0.80
0.25
0.30
0.25
13
U20502
50
0.47~0.55
0.17~0.37
0.50~0.80
0.25
0.30
0.25
14
U20552
55
0.52~0.60
0.17~0.37
0.50~0.80
0.25
0.30
0.25
15
U20602
60
0.57~0.65
0.17~0.37
0.50~0.80
0.25
0.30
0.25
7
16
U20652
65
0.62~0.70
0.17~0.37
0.50~0.80
0.25
0.30
0.25
17
U20702
70
0.67~0.75
0.17~0.37
0.50~0.80
0.25
0.30
0.25
18
U20752
75
0.72~0.80
0.17~0.37
0.50~0.80
0.25
0.30
0.25
19
U20802
80
0.77~0.85
0.17~0.37
0.50~0.80
0.25
0.30
0.25
20
U20852
85
0.82~0.90
0.17~0.37
0.50~0.80
0.25
0.30
0.25
21
U21152
15Mn
0.12~0.18
0.17~0.37
0.70~1.00
0.25
0.30
0.25
22
U21202
20Mn
0.17~0.23
0.17~0.37
0.70~1.00
0.25
0.30
0.25
23
U21252
25Mn
0.22~0.29
0.17~0.37
0.70~1.00
0.25
0.30
0.25
24
U21302
30Mn
0.27~0.34
0.17~0.37
0.70~1.00
0.25
0.30
0.25
25
U21352
35Mn
0.32~0.39
0.17~0.37
0.70~1.00
0.25
0.30
0.25
26
U21402
40Mn
0.37~0.44
0.17~0.37
0.70~1.00
0.25
0.30
0.25
27
U21452
45Mn
0.42~0.50
0.17~0.37
0.70~1.00
0.25
0.30
0.25
28
U21502
50Mn
0.48~0.56
0.17~0.37
0.70~1.00
0.25
0.30
0.25
29
U21602
60Mn
0.57~0.65
0.17~0.37
0.70~1.00
0.25
0.30
0.25
30
U21652
65Mn
0.62~0.70
0.17~0.37
0.90~1.20
0.25
0.30
0.25
31
U21702
70Mn
0.67~0.75
0.17~0.37
0.90~1.20
0.25
0.30
0.25
Note: Those listed in Table 1 are quality steels. In case of premium-grade quality st eel, letter "A" shall be added to the end of the designation number (the last digit of the unified numerical code to be changed to "3"); in case of special-grade quality steel, letter "E" shall be added to the end of the designation number (the last digit of the unified numerical code to be changed to "6"); for rimming steel, the end of the designation number is "F" (the last digit of the unified numerical code being "0"); for semi-killed steel, the end of the designation number is "b" (the last digit of the unified numerical code being "1").
GB/T 699
6.1.1.6
1999
The silicon content of rimming steel for cold punch pressing should not be higher
than 0.03%. 6.1.1.7
The nitrogen content of steels smelted in oxygen-blown converters should not be
higher than 0.008%. If the supplier can guarantee the conformance, the analysis may be omitted. 6.1.1.8
As agreed between the buyer and the supplier, for 08~25 steels, semi-killed steels
with silicon content not higher than 0.17% may be supplied, with grade numbers of 08b~25b. 6.1.2
The allowance for chemical composition of steel material (or billets) should comply
with the stipulation in Table 2 of GB/T 222-1984. Table 2 P
Group
S Not higher than, %
Quality steel
0.035
0.035
Premium-grade quality steel
0.030
0.030
Special-grade quality steel
0.025
0.020
8
6.2
Smelting Method
Unless otherwise specified in the contract, the smelting method shall be chosen by the manufacturer of its own accord. 6.3
State of Delivery
Steel material is normally delivered in the hot rolled or hot forged state. It may also be delivered in the heat treated (annealed, normalized or high temperature tempered) if the buyer so requests and if so stated in the contract. 6.4
6.4.1
Mechanical Properties
The longitudinal mechanical properties of steel material obtained by testing the
specimen made with heat-treated (normalized) work blank (excluding impact absorbed work) should comply with the stipulation in Table 3. For steel material delivered in the hot rolled or hot forged state, if the supplier can guarantee the conformance, the tests may be omitted. As required by the buyer, the impact absorbed work of 25~50 and 25Mn~50Mn steels obtained by testing the specimen made with heat treated (quenched + tempered) work blank should comply with the stipulation in Table 3 Round steels with diameter smaller than 16mm and square or flat steels with thickness not greater than 12mm shall not be subject to the impact test. 6.4.2
The mechanical properties shown in Table 3 are only applicable to steel material with
cross-section size not greater than 80mm. For that with cross-section greater than 80mm, the after-breaking elongation and percentage reduction of section are allowed to be lower than those GB/T 699
1999
specified in Table 3 by 2% (absolute) and 5% (absolute) respectively. Where steel material with size larger than 80mm to 120mm is re-forged to test piece sized between 70mm and 80mm, the result of the sampling test should comply with the stipulation in Table 3. Where steel material with size larger than 120mm to 250mm is re-forged to test piece sized between 90mm and 100mm, the result of the sampling test should comply with the stipulation in Table 3. 6.4.3
The hardness of steel material for cutting work or for cold drawn material in the
delivery state should comply with the stipulation in Table 3. For the hardness of non-annealed steel, if the supplier can guarantee the conformance, the test may be omitted. The hardness indexes after high temperature tempering and normalization shall be determined by agreement between the supplier and the buyer. Table 3
9
Proposed heat
No.
n o i t a n g i s e D
Mechanical Properties
treatment,
Hardness of steel material in delivery state
Specimen blank size mm
n o i t a z i l a m r o N
g n i h c n e u Q
g n i r e p m e T
σb
σs
δ5
ψ
AKU2
MPa
MPa
%
%
J
HBS10/3
Non-heat
Not less than
treated steel
000
Annealed steel
1
08F
25
930
295
175
35
60
131
2
10F
25
930
315
185
33
55
137
3
15F
25
920
355
205
29
55
143
4
08
25
930
325
195
33
60
131
5
10
25
930
335
205
31
55
137
6
15
25
920
375
225
27
55
143
7
20
25
910
410
245
25
55
156
8
25
25
900
870
600
450
275
23
50
71
170
9
30
25
880
860
600
490
295
21
50
63
179
10
35
25
870
850
600
530
315
20
45
55
197
11
40
25
860
840
600
570
335
19
45
47
217
187
12
45
25
850
840
600
600
355
16
40
39
229
197
13
50
25
830
830
600
630
375
14
40
31
241
207
14
55
25
820
820
600
645
380
13
35
255
217
10
GB/T 699
1999
Table 3 Proposed heat
No.
n o i t a n g i s e D
Mechanical Properties
treatment,
Hardness of steel material in delivery state
Specimen blank size mm
n o i t a z i l a m r o N
g n i h c n e u Q
g n i r e p m e T
σb
σs
δ5
ψ
AKU2
MPa
MPa
%
%
J
HBS10/3 Non-heat
Not less than
treated steel
000
Annealed steel
15
60
25
810
675
400
12
35
255
229
16
65
25
810
695
410
10
30
255
229
17
70
25
790
715
420
9
30
269
229
18
75
specimen
820
480
1 080
880
7
30
285
241
19
80
specimen
820
480
1 080
930
6
30
285
241
20
85
specimen
820
480
1 130
980
6
30
302
255
21
15Mn
25
920
410
245
26
55
163
22
20Mn
25
910
450
275
24
50
197
23
25Mn
25
900
870
600
490
295
22
50
71
207
24
30Mn
25
880
860
600
540
315
20
45
63
217
187
25
35Mn
25
870
850
600
560
335
18
45
55
229
197
26
40Mn
25
860
840
600
590
355
17
45
47
229
207
27
45Mn
25
850
840
600
620
375
15
40
39
241
217
28
50Mn
25
830
830
600
645
390
13
40
31
255
217
29
60Mn
25
810
695
410
11
35
269
229
30
65Mn
25
830
735
430
9
30
285
229
31
70Mn
25
790
785
450
8
30
285
229
11
Notes: 1. For steel material with diameter or thickness less than 25mm, heat treatment is conducted on the specimen blank with the same cross-section size as that of finished products. 2. The proposed temperature holding time for normalization as listed in the table is not less than 30 minutes with air cooling; that for quenching is not less than 30 minutes with oil cooling for 75, 80 and 85 steels and water cooling for other steels; that for tempering is not less than 1 hour.
GB/T 699
6.5
6.5.1
1999
Upsetting
Steels for upsetting work shall be subject to upsetting test and either hot upsetting or
cold upsetting should be clearly stated in the contract. The height of specimen after hot upsetting shall be as much as 1/3 of that of the original specimen; the height of specimen after cold upsetting shall be as much as 1/2 of that of the original specimen. No fissure or fracture shall exist on the specimen after the upsetting. 6.5.2
For steel material with size larger than 80mm that requires hot upsetting, or that with
size larger than 30mm that requires cold upsetting, if the supplier can guarantee the conformance, the test may be omitted. 6.6
6.6.1
Macroscopic Structure
There should be no shrinkage cavity, blister, crack, inclusion, skull patch or fish eye
visible to the naked eyes on the cross-sectional pickled macroscopic structure specimen of killed steel material. Such imperfections as subsurface inclusion not exceeding the allowable depth for surface imperfection are allowed on the steel material for cutting work. 6.6.2
Pickled macroscopic structure should comply with the stipulation in Table 4. Table 4
Quality grade
General poriness
Central poriness
Ingot mold aliquation
Level (not greater than) Quality steel
3.0
3.0
3.0
Premium-grade quality steel
2.5
2.5
2.5
Special-grade quality steel
2.0
2.0
2.0
6.6.3
If the supplier can guarantee the conformance of macroscopic test, it is allowable to
substitute ultrasonic test or other nondestructive tests specified in standard GB/T 7736 for the macroscopic test. 12
6.7
Non-metallic Inclusion
As required by the buyer, non-metallic inclusions may be tested with the acceptable levels to be defined by agreement between the buyer and the supplier. 6.8
Decarburized Layer
When testing the decarburized layer of steels with nominal carbon content higher than 0.30%, as required by the buyer, the total depth of decarburized layer on each side (ferrite + transition layer) should comply with the stipulation in Table 5. The buyer should indicate the group in the contract.
GB/T 699
1999
Table 5
mm
Group
Allowable total depth of decarburized layer (not higher than)
Group I
1.0%D
Group II
1.5%D
Note: D is the nominal diameter or thickness of steel material 6.9
6.9.1
Surface Quality
There should be no crack, rolling skin, folding or inclusion visible to the naked eyes on
the surface of steel material for pressed work. Any of the above imperfections should be removed to such extent that the removed depth as calculated from the surface of steel material is in compliance with the stipulation in Table 6. The width for removal should not be less than 5 times the depth. For steel material with diameter or side length larger than 140mm, no more than 2 places with maximum removal depth are allowed on the same cross section. It is allowable to have very few fine scratches, impression marks and pork marks with size not exceeding half of the size allowance as calculated from the actual size and fine crackles with depth within 0.2mm in existence. 6.9.2
Local imperfections with depth not exceeding the stipulation in Table 7 as calculated
from the nominal size of steel material are allowable on the surface of steel material for cutting work. Table 6 Nominal size of steel material (diameter or depth) < 80 80~140
mm
Allowable depth of imperfection removal 1/2 of nominal size allowance of steel material Nominal size allowance of steel material
13
>140 ~ 200
5% of nominal size of steel material
> 200
6% of nominal size of steel material Table 7
mm
Nominal size of steel material
Allowable depth of local imperfection
(diameter or thickness)
(not greater than)
< 100
Negative allowance of nominal size of steel material Allowance of nominal size of steel material
100
GB/T 699
6.10
1999
Special Requirements
As required by the buyer and so agreed between the buyer and the supplier, steel material meeting the following special requirements may be supplied: a) To narrow or modify the range of chemical composition specified in Table 1; b) Steel bars with diameter or thickness larger than 250mm; c) To test the grain fineness of steel; d) To test the microstructure of steel; e) To test the hair line seams with telescoping (tower) specimen; f) To make the mechanical properties indexes stricter; g) To make V-notched impact test (the indexes to be agreed between the buyer and the supplier); h) Other. 7
Test Methods
Test methods for each and every batch of steel material should comply with the stipulation in Table 8. Table 8. No. 1
Test item Chemical
Quantity of samples 1
Location for sampling GB/T 222
composition 2
Tensile test
Test method GB/T 223 GB/T 4336
2
Different pieces of steel material
GB/T 228 GB/T 2975
14
GB/T 6397 3
Hardness test
3
Different pieces of steel material
GB/T 231
4
Impact test
2
Different pieces of steel material
GB/T 229
5
Upsetting test
2
Different pieces of steel material
GB/T 233
6
Macroscopic
2
Different pieces of steel billet or steel
GB/T 226
material equivalent to the end of steel
GB/T 1979
structure
ingot 7
Telescoping
2
Different pieces of steel material
GB/T 15711
2
Different pieces of steel material
GB/T 224
(tower) hair line seams 8
Decarburization
(metallo-graphic)
15
GB/T 699
1999
Table 8. No.
Test item
Quantity of
Location for sampling
samples
Test method
9
Grain fineness
1
Any piece of steel material
YB/T 5148
10
Non-metallic
2
Different pieces of steel material
GB/T 10561
inclusion 11
Microstructure
2
Different pieces of steel material
GB/T 13299
12
Ultrasonic test
2
On the whole of steel material
GB/T 7736
13
Size,
Piece by
On the whole of steel material
Caliper,
dimensions 14
Visual aspects
piece Piece by
micrometer On the whole of steel material
Visual inspection
piece 8
Test Rules 8.1
8.1.1
Inspection and Acceptance
The quality of steel material shall be inspected and accepted by the quality technical
supervision department of the supplier. 8.1.2
The supplier must ensure that the steel material delivered complies with the stipulations
of this standard or of the contract. The buyer is entitled to make inspection or acceptance to any of the test items defined in this standard or the contract if necessary. 8.2 Batch Forming Rules
Steel material should be inspected and accepted batchwise. Each batch consists of steel material with the same heat (furnace) number, the same working method, the same size, the same delivery state (or the same heat treatment system/furnace lot) and the same surface state. 8.3 Quantity and Location for Sampling
The quantity and location for sampling of steel material should comply with the stipulation in Table 8. 8.4 Re-inspection and Judging Rules
8.4.1
The re-inspection and judging rules shall be in compliance with relevant stipulations in
8.3.4.3 of standard GB/T 17505-1998. 8.4.2
If the supplier can guarantee the conformance of the steel material, it is allowable to
substitute billet for material or large pieces for small ones with respect to the test results of 16
macroscopic test, mechanical properties and non-metallic inclusion for the steel material or ingots with the same heat (furnace) number. GB/T 699
9
1999
Packaging, Marking and Quality Certificate
Packaging, marking and quality certificates of the steel material should comply with the stipulations of GB/T 2101. Annex A
Annex to the Standard
Normative References - Methods for Chemical Analysis
GB/T 223.3 – 1988
Methods for chemical analysis of iron, steel and alloy The diantipyryl-methane phosphomolybdic acid gravimetric method for the determination of phosphorus content
GB/T 223.5 – 1997
Methods for chemical analysis of iron, steel and alloy The reduced molybdosilicate spectrophotometric method for the determination of acid-soluble silicon content
GB/T 223.10 - 1991
Methods for chemical analysis of iron, steel and alloy The determination of aluminum content by chrome azurol S photometric method after separation with cupferron
GB/T 223.11 - 1991
Methods for chemical analysis of iron, steel and alloy The determination of chromium content by persulfate oxdation volumetric method
GB/T 223.12 - 1991
Methods for chemical analysis of iron, steel and alloy The determination of chromium content by diphenyl carbazide photometric method after separation with sodium carbonate
GB/T 223.18 - 1994
Methods for chemical analysis of iron, steel and alloy The sodium thiosulfate separation iodimetric method for the determination of copper content
GB/T 223.19 - 1989
Methods for chemical analysis of iron, steel and alloy The determination of copper content by neocuprone-photometric 17
method GB/T 223.23 - 1994
Methods for chemical analysis of iron, steel and alloy The dimethylglyoxime spectrophotometric method for the determination of nickel content
GB/T 223.24 - 1994
Methods for chemical analysis of iron, steel and alloy The extraction separation - The dimethylglyoxime spectrophoto method for the determination of nickel content
GB/T 223.36 - 1994
Methods for chemical analysis of iron, steel and alloy The neutral titration method for the determination of nitrogen content after distillation separation GB/T 699
GB/T 223.37 - 1989
1999
Methods for chemical analysis of iron, steel and alloy The indigo photometric method for the determination of nitrogen content after distillation separation
GB/T 223.53 - 1987
Methods for chemical analysis of iron, steel and alloy The determination of copper content by flame atomic absorption spectrophotometry
GB/T 223.54 - 1987
Methods for chemical analysis of iron, steel and alloy The determination of nickel content by flame atomic absorption spectrophotometry
GB/T 223.58 - 1987
Methods for chemical analysis of iron, steel and alloy The determination of manganese content by sodium arsenite – sodium nitrite titration method
GB/T 223.59 - 1987
Methods for chemical analysis of iron, steel and alloy The
determination
of
phospgorus
content
by
antimonium-Phosphorus-Molybdium-blue photometric method GB/T 223.60 - 1997
Methods for chemical analysis of iron, steel and alloy The perchloric acid dehydration gravimetric method for the determination of silicon content 18
GB/T 223.61 - 1988
Methods for chemical analysis of iron, steel and alloy The
determination
of
phosphorus
content
by
ammonium
molybdo-phosphate volumetric method GB/T 223.62 - 1988
Methods for chemical analysis of iron, steel and alloy The determination of phosphorus content by butyl acetate extraction photometric method
GB/T 223.63 - 1988
Methods for chemical analysis of iron, steel and alloy The determination of manganese content by sodium (potassium) permanganate photometric method
GB/T 223.64 - 1988
Methods for chemical analysis of iron, steel and alloy The determination of manganese content by flame atomic absorption spectrometric method
GB/T 223.67 - 1989
Methods for chemical analysis of iron, steel and alloy The determination of sulfur content methylidyne blue photometric method after reduced distillation
GB/T 223.68 - 1997
Methods for chemical analysis of iron, steel and alloy The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
GB/T 223.69 - 1997
Methods for chemical analysis of iron, steel and alloy The gas-volumetric method after combustion in the pipe furnace for the determination of carbon content GB/T 699
GB/T 223.71 - 1997
1999
Methods for chemical analysis of iron, steel and alloy The volumetric method after combustion in the pipe furnace for the determination of carbon content
GB/T 223.72 - 1991
Methods for chemical analysis of iron, steel and alloy Aluminum oxide stratography - barium sulfate gravimetric method for the determination of sulfur content
19
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