This standard specifies the principle, symbols, specimen preparation and requirements, test instruments and equipment, test conditions and procedures, and test reports for the test method for strain aging sensitivity of steel. This standard is applicable to steel plates, steel strips, bars, profiles, and special-shaped steels with a thickness greater than or equal to 6 mm. GB/T 4160-2004 Test method for strain aging sensitivity of steel (Charpy impact method) GB/T4160-2004 standard download decompression password: www.bzxz.net

GR/T4160—2004
102 Test method for time-dependent impact resistance of steel>standard. In this standard, the main reference is TOCT7253. Compared with FOCT7258198, this standard replaces GB/T4160-1994. The main technical changes are as follows: the sample preparation and key times, test conditions and results, test report, etc. have been adjusted; the original equipment, etc. have been added; the specification of the strain aging card has been eliminated; the tensile test sample with a width of 30mrr15Tm has been cancelled; the strain temperature range of 1-35℃ has not been clarified. This standard was issued by the Ministry of Education Industry Association of China. The National Technical Committee for Standardization of Steel Standardization is responsible for this standard. Unit: Shougang Corporation, Steel Research Institute: Shanghai Standard Drafting Person: Ministry of Agriculture, Ministry of Finance Handling: This standard was published in 2004.
1 Scope
Test method for strain aging sensitivity of steel
(Charpy impact method)
GB/T4160—2004
This standard specifies the principle, symbols, preparation and requirements of specimens, test apparatus and procedures, test procedures and test reports for the strain aging sensitivity test of steel.
This standard is applicable to steel plates, steel bars, steel strips, single steels and special steels with a thickness of 6 mm.m or more: 2 Normative referenced documents
The following documents are used in conjunction with the standard or are not applicable to the provisions of this standard. All cited documents with a specified date shall be used in conjunction with the standard. , all subsequent modifications (excluding those for immersion aids) or revisions are not applicable to this standard. However, it is encouraged to consider whether the latest versions of these documents can be used in accordance with the standards. For undated references, the latest versions apply to this standard. G/T 225 Tensile test method for materials (GR/T 228-202, CQV150E202: 1998) G/T 223 Impact test method for steel products (G/229-1994 IS86, 1S014B: 1983) GB/T 297 Test method for steel and products and preparation of test specimens (G3/T 295-1998, EN1503771S7
3 Symbols and instructions
Symbols used in supplementary standards , description and unit are shown in Table 1. 4 Principle
Determine the impact absorption of the steel after artificial aging with specified strain. Compare the impact absorption of the steel after artificial aging with that after specified strain. The strain aging sensitivity coefficient of copper is obtained, and the strain aging sensitivity of steel is shown. 5 Preparation and requirements of test specimens
5.1 The cutting area of ​​the sample shall be in accordance with the relevant product approval or the agreement between the supplier and the supplier. If it is not specified, it shall be in accordance with the provisions of 1275. The orientation of the sample after artificial aging shall be consistent with that of the sample without artificial aging. The cut sample shall avoid overheating or work hardening that affects its performance.
5.2 For the steel with a diameter of equal to i2:rm, the size of the tensile sample is 12mm×12mm×mm. and one rolling surface shall be retained. For steel with small thickness, the size of the tensile sample is mm and two rolling surfaces shall be retained. 5.3 For materials with a thickness of 12mm or more, the size of the compression test sample is: 2mm×12mm×57mm and a rolled thickness of 3×12mm is retained. The size of the sample is also 1mm×12mm×=7mm, and two rolled surfaces should be retained. 5.4 The impact test pieces prepared by acoustic aging should comply with the provisions of GB/22U for test pieces. The type of impact test for determining the strain duration should be specified in the agreement between the supply and demand parties of the relevant product standards. If specified, the test sample of 1m×lnm×5=tt7.5am×15mn×5.5mm×1cmm×55mm is used according to the steel strength. It is recommended to use more types of impact tests. wwW.bzxz.Net
5.5 When determining the strain effect coefficient, the type and size of the sample that has not been subjected to aging must be consistent with the test sample that has been subjected to strain aging.
GB/T 4160—2004
6 Testing instruments and equipment
6.1 Scanning equipment can be used for testing. 6.2 The temperature-controlled heating plate should be able to ensure that the samples are heated and heated before reaching the specified aging temperature. 7 Test conditions and steps
Unadjusted aging
Average estimate of the impact energy absorbed by the edge after vertical strain
After the specified strain and artificial aging ... 0us
1 The impact sample should be used for the aging rate of the impact sample. The impact sample should be used for the aging rate of the impact sample. The sample length should be controlled according to the sample mark. 7.1 The tensile strain should be used: the tensile strain of the sample should be kept consistent with the longitudinal axis of the test machine as much as possible. The distance from the test machine chuck to the two ends of the tensile test mark should not be less than 101nrt. The tensile speed should be controlled within the test speed for determining the tensile strength specified in G/T228. The tensile strain of the sample should be carried out according to the relevant product standards or the agreement between the supply and demand parties. If there is no specific determination, the standard deviation of the standard for metal should be 15%, and the standard deviation of alloy steel should be 5%, and the deviation is ±0.5%: the tensile test certificate should be marked with a 120mm or 170mm gauge length. 7.2 According to the relevant product standard, compression deformation is allowed. The compression shall be multiplied by the pressure applied during the rolling process to obtain residual deformation consistent with the requirements of 7.1. 7.3 The deformation shall be carried out under 10~35°C. 7.4 After straining, the prepared specimens shall be artificially aged according to the provisions of the relevant product standard and the agreement between the supplier and the buyer. If required, the specimens shall be uniformly heated at 250 ± 10°C and kept at this temperature for 1 hour, and then cooled in air to room temperature. Artificial aging is allowed on the specimens cut after straining or on the specimens after polishing. 7.5 The impact test shall be carried out in accordance with the provisions of GB/T223. The strain aging sensitivity coefficient is determined by the agreement between the supplier and the buyer. The tests without strain aging and the tests with strain aging shall be carried out on the same impact testing machine. 7. The impact test intensity shall be specified in the relevant product standards. If the number is not specified, the test shall be carried out at 10°C to 35°C. The test with strict requirements on the test intensity shall be carried out at 20 ± 2°C. When determining the strain aging sensitivity coefficient, the impact test temperature without strain aging and the test temperature with strain aging shall be the same: GB/I4160—2004
7.7 The number of impact specimens for determining the strain aging impact performance shall be specified in the relevant product standards or the agreement between the supplier and the buyer. If specified, it shall not be less than three. The impact specimens used for determining the strain aging sensitivity coefficient shall generally not be less than six: one of which is in the strain aging state and the other is in the strain aging state. B. Test report
The test report should at least include the following contents:
a) National standard number;
h) Sample mark (material brand, furnace, etc.); Sample type and size;
The strain method and residual strain amount used;
Artificial aging temperature, maintenance time and cold unloading temperature;
Strain leakage and impact test temperature
The impact absorption energy of the strain aging state, the impact absorption energy of the state not subjected to strain aging and the strain aging inductance coefficient;
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