GB/T 33083-2016 English PDF (GBT33083-2016)

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GB/T 33083-2016: Heavy carbon structural steel forgings - Technical specification
GB/T 33083-2016
Heavy carbon structural steel forgings--Technical specification
ICS 77.140.85
J32
National Standards of People's Republic of China
Technical conditions for large carbon structural steel forgings
Released on October 13,.2016
2017-05-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword III
1 range 1
2 Normative references 1
3 Ordering requirements 1
4 Manufacturing Process 1
4.1 Smelting 1
4.2 Forging 1
4.3 Heat Treatment 1
4.4 repair welding 2
5 Technical requirements 2
5.1 Chemical composition 2
5.2 Mechanical properties 3
5.3 hardness 4
5.4 Nondestructive testing 4
6 Inspection rules and test methods 4
6.1 Chemical composition analysis 4
6.2 Mechanical properties test 5
6.3 Hardness test 7
6.4 Retest 7
6.5 Reheating 7
7 Acceptance and Quality Certificate 7
8 signs and packaging 8
Figure 1 Solid shaft, square and rectangular forging sampling position 6
Figure 2 Hollow cylinder forging sampling position 6
Figure 3 Disk forging sample sampling position 6
Figure 4 Ring forging sampling position 7
Table 1 Chemical composition 2
Table 2 Allowable deviation of chemical composition of finished products 3
Table 3 Mechanical properties 3
Table 4 Level and inspection items 5
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Large-scale Casting and Forging Standardization Technical Committee (SAC/TC506).
This standard was drafted. China First Heavy Machinery Co., Ltd., Tianjin Heavy Equipment Engineering Research Co., Ltd., Harbin Daji Research
Research institute.
The main drafters of this standard. Zhang Guoli, Zhao Li, Yan Jinhui, Wang Huiting, Yan Shoutai, Zhang Haifeng.
Technical conditions for large carbon structural steel forgings
1 Scope
This standard specifies the ordering requirements, manufacturing process, technical requirements and inspection rules for carbon structural steel forgings for general use in mechanical products.
And test methods, acceptance and quality certificates and signs and packaging.
This standard applies to the ordering, manufacturing and inspection of large carbon structural steel forgings for general use.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 223 (all parts) Steel and alloy chemical analysis methods
GB/T 228.1 tensile testing of metallic materials - Part 1. Test methods for room temperature (GB/T 228.1-2010, ISO 6892-1.
2009, MOD)
GB/T 229 Metallic material Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1.2006, MOD)
GB/T 231.1 Brinell hardness test for metallic materials - Part 1. Test methods (GB/T 231.1-2009, ISO 6506-1.
2005, MOD)
3 Ordering requirements
3.1 The purchaser shall specify the name of the forging, the material grade, the standard number, grade, corresponding technical requirements and inspection in the order contract.
Project, delivery status and quantity supplied, and other additional instructions.
3.2 The purchaser shall provide the order drawings or related finishing drawings.
3.3 When the demand side has additional requirements, it shall be agreed upon by the supplier and the buyer.
4 manufacturing process
4.1 Smelting
The steel for forgings shall be smelted by electric furnace smelting or other smelting method with the quality agreed by the user.
4.2 Forging
4.2.1 Forgings shall be forged by steel ingots or billets. When the forgings are directly forged by steel ingots, the ingots and the risers should have
Sufficient removal to ensure that the forgings are free of shrinkage and severe segregation.
4.2.2 Forgings shall be forged on a forging equipment of sufficient capacity to ensure forging and uniformity of the structure. Forgings allow multiple forgings.
4.3 Heat treatment
Forgings should be subjected to high temperature tempering or normalizing plus tempering or other means of slow cooling to improve tissue and machinability. According to forgings
The material grade and strength grade may be normalized, normalized or tempered or quenched and tempered. Forgings allow multiple heat treatments.
4.4 repair welding
For defective forgings, the welding performance results meet the mechanical properties of the same material grade and are approved by the purchaser before they can pass.
Repair welding for repair.
5 Technical requirements
5.1 Chemical composition
5.1.1 The supplier shall conduct smelting analysis for each furnace (per pack) of molten steel, and the results of the analysis shall comply with Table 1. Average weight of report when multi-furnace is poured
Analysis results.
5.1.2 When the demander has special requirements, the supplier shall analyze the finished product for the forging. The chemical composition shall comply with the requirements of Table 1, but Table 2 is allowed.
The specified deviation.
Table 1 Chemical composition % (mass fraction)
Material grade C Si Mn
PS Cr Ni Cu
10 0.07~0.13 0.17~0.37 0.35~0.65 0.025 0.025 0.15 0.30 0.25
15 0.12~0.18 0.17~0.37 0.35~0.65 0.025 0.025 0.25 0.30 0.25
20 0.17~0.23 0.17~0.37 0.35~0.65 0.025 0.025 0.25 0.25 0.25
25 0.22~0.29 0.17~0.37 0.50~0.80 0.025 0.025 0.25 0.25 0.25
30 0.27~0.34 0.17~0.37 0.50~0.80 0.025 0.025 0.25 0.25 0.25
35 0.32~0.39 0.17~0.37 0.50~0.80 0.025 0.025 0.25 0.25 0.25
40 0.37~0.44 0.17~0.37 0.50~0.80 0.025 0.025 0.25 0.25 0.25
45 0.42~0.50 0.17~0.37 0.50~0.80 0.025 0.025 0.25 0.25 0.25
50 0.47~0.55 0.17~0.37 0.50~0.80 0.025 0.025 0.25 0.25 0.25
55 0.52~0.60 0.17~0.37 0.50~0.80 0.025 0.025 0.25 0.25 0.25
60 0.57~~0.65 0.17~0.37 0.50~0.80 0.025 0.025 0.25 0.25 0.25
16Mn 0.12~0.20 0.20~0.60 1.20~1.60 0.025 0.025 0.35 0.35 0.25
40Mn 0.37~0.44 0.17~0.37 0.70~1.00 0.025 0.025 0.25 0.25 0.25
50Mn 0.48~0.56 0.17~0.37 0.70~1.00 0.025 0.025 0.25 0.25 0.25
60Mn 0.57~0.65 0.17~0.37 0.70~1.00 0.025 0.025 0.25 0.25 0.25
Approved by the purchaser, the chemical composition analysis results of 10 and 15 steels may not be accepted.
When vacuum carbon deoxidation is used, the Si content is not more than 0.10%.
Table 2 Allowable deviation of chemical composition of finished products
element
Prescribed chemical composition
Upper limit/%
Cross-sectional area/cm2
≤650 >650~1300 >1300~2600>2600~5200 >5200~10400 >10400
Allowable deviation value /% above the upper or lower limit of the specified value
≤0.25 ±0.02 ±0.03 ±0.03 ±0.04 ±0.05 ±0.05
>0.25~0.50 ±0.03 ±0.04 ±0.04 ±0.05 ±0.06 ±0.06
≥0.50 ±0.04 ±0.05 ±0.05 ±0.06 ±0.07 ±0.07
Si
≤0.37 ±0.02 ±0.03 ±0.04 ±0.04 ±0.05 ±0.08
>0.37 ±0.05 ±0.06 ±0.06 ±0.07 ±0.07 ±0.09
Mn
≤0.90 ±0.03 ±0.04 ±0.05 ±0.06 ±0.07 ±0.08
>0.90 ±0.06 ±0.06 ±0.07 ±0.08 ±0.08 ±0.09
P ≤0.025 0.002 0.002 0.003 0.003 0.004 0.004
S ≤0.025 0.002 0.002 0.003 0.003 0.004 0.004
5.2 Mechanical properties
The mechanical properties of the forgings are to comply with the requirements of Table 3.
Table 3 Mechanical properties
Material grade heat treatment state
Section size
Mm
Mechanical properties
Rm
MPa
ReL
MPa
KU2
Hardness value
HBW
10 -
>100~250 ≥320 195 30 52 -
>250~500 ≥320 185 30 52 -
15 -
>100~250 ≥320 205 25 50 -
>250~500 ≥320 195 25 45 -
20 normal or normal fire
>100~250 380~520 210 25 50 39
>250~500 380~520 210 25 45 39
>500~1000 380~520 205 24 45 35
112~156
25 or 30 normalizing or normalizing tempering
>100~250 390~530 215 20 48 31
>250~500 380~520 205 18 40 31
>500~1000 380~520 205 17 35 27
126~170
35 or 40
Normalizing or normalizing tempering
>100~250 480~670 245 17 40 38
>250~500 470~630 235 16 37 34
>500~1000 460~610 225 15 30 31
143~187
Tempering
>100~250 490~640 295 22 40 40 189~229
>250~500 470~640 275 21 - 38 163~219
Table 3 (continued)
Material grade heat treatment state
Section size
Mm
Mechanical properties
Rm
MPa
ReL
MPa
KU2
Hardness value
HBW
45 or 50
Normalizing or normalizing tempering
>100~250 570~750 275 15 - -
>250~500 560~720 265 14 - -
>500~1000 550~720 255 13 - -
163~217
Tempering
>100~250 620~740 345 18 35 31 197~269
>250~500 590~720 315 17 - - 187~255
55 or 60
Normalizing or normalizing tempering
>100~250 640~880 375 12 - -
>250~500 620~830 345 11 - -
>500~1000 600~800 315 10 - -
200~240
Tempering
>100~250 630~780 365 17 - - 207~302
>250~500 630~780 335 16 - - 197~269
16Mn normal or normalized tempering
>100~250 ≥500 295 16 32 25 148~188
>250~500 ≥470 275 15 30 22 138~178
>500~750 ≥440 255 13 28 19 130~170
40Mn
50Mn
60Mn
Normalizing or normalizing tempering
< 250 ≥590 350 17 45 47 ≥207
< 250 ≥645 390 13 40 31 ≥217
< 250 ≥695 410 11 35 - ≥229
5.3 hardness
Forgings are only required to be tested for hardness. The hardness deviation of the same forgings does not exceed 40HBW, and the hardness of the same forgings is relatively poor.
50HBW. However, when the forging requires tensile properties at the same time, the absolute value of the hardness is not used as the basis for acceptance.
5.4 Non-destructive testing
5.4.1 General requirements
Forgings shall not have white spots, cracks, folds, shrinkage cavities, severe segregation and severe non-metallic inclusions, etc.
Defects in quality.
5.4.2 Ultrasonic testing
When the order contract has provisions, the method and acceptance criteria for ultrasonic testing shall be stated in the order contract or the ordering technical agreement.
6 Inspection rules and test methods
6.1 Chemical composition analysis
6.1.1 Analysis method
Chemical composition analysis shall be carried out in accordance with the method specified in GB/T 223 or other methods approved by the purchaser to ensure the quality of the analysis.
6.1.2 Melting analysis
6.1.2.1 Each furnace (package) of molten steel shall be sampled at the time of pouring to determine the chemical composition of the molten steel.
6.1.2.2 When the smelting analysis is not possible, the finished product analysis is allowed to replace the smelting analysis, and the analysis results should meet the requirements of the finished product analysis.
6.1.3 Analysis of finished products
The finished product analysis sample can be taken from the forging body or its extension, or it can be taken from a mechanical property sample.
6.2 Mechanical properties test
6.2.1 Inspection items and sampling quantities
6.2.1.1 According to the different uses and requirements of forgings, refer to Table 4 for the selected level and inspection items.
Table 4 Level and inspection items
Grade inspection project group batch condition mechanical properties hardness
I - - - -
II hardness
Same material grade, same heat treatment heat,
Forgings of the same or similar dimensions
- 5% for each batch, but not less than 5
III Hardness single piece - each piece is inspected
Stretching, impact,
hardness
Same melting furnace number, same heat treatment furnace
Forgings of the same or similar dimensions
The number of random inspections per batch is 2%, but not less than
2 pieces, only one set of samples is taken for the same forging.
It can also be added when the buyer has special requirements.
Number of samples
Every piece is inspected
(for reference)
Stretching, impact,
hardness
a piece
Each piece is inspected and a set of samples is taken. Demand side
Increase the number of samples when there are special requirements
Every piece is inspected
(for reference)
6.2.1.2 Forgings are required for tensile and impact tests. The number of samples per set is one stretch and two impacts (KU2).
6.2.2 Sampling position and direction
6.2.2.1 Except for the contract or order agreement, the order pattern is allowed to be replaced by the simulated test piece, the tensile and impact specimens of the forging shall be taken from the extension of the forging
Long part (longer section or more) or remainder.
6.2.2.2 The sampling direction shall comply with the following provisions.
a) For axial, square or rectangular forgings, the direction of the tensile and impact specimens shall be axial (longitudinal);
b) Hollow cylinder, disc, and ring forging, the direction of the tensile and impact specimens shall be tangential (circumferential direction).
6.2.2.3 When the sampling pattern does not specify the sampling position, it can be sampled as follows.
a) The specimen of the solid shaft forging is taken from the one-third radius from the surface, and the specimen of the square and rectangular forging is taken from the diagonal top
Point to the center of the third (see Figure 1);
b) The specimen of the hollow cylinder forging is taken from one-half of the wall thickness (see Figure 2);
c) Disc forgings, when sampling at an enlarged outer diameter, the specimen shall be taken from most of the height of one-half; when taken at the extended portion
In the case of samples, the specimen shall be taken from a radius of one third of the outer edge or at least 20 mm from the edge (see Figure 3);
d) Forged forgings, when sampling at an enlarged outer diameter, the specimen shall be taken from most of the height of one-half; when taken at the extended portion
When the sample is taken, the sample should be taken from one-half of the wall thickness (see Figure 4).
Figure 1 Solid shaft, square and rectangular forging sampling position
Figure 2 Hollow cylinder forging sampling position
Figure 3 Disk forging sample sampling position
Figure 4 Ring forging sampling position
6.2.3 Test methods
6.2.3.1 The tensile test shall be carried out in accordance with the provisions of GB/T 228.1.