GB/T 7964-2020 in English

VALID

Sintered metal materials( excluding hardmetal )—Tension testing at room temperature

Issued on:2020-03-06
Implemented on:2021-02-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $140.00
$136.00

Standard No:	GB/T 7964-2020
Document status:	VALID
Title in English:	Sintered metal materials( excluding hardmetal )—Tension testing at room temperature
Title in Chinese:	烧结金属材料(不包括硬质合金) 室温拉伸试验
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-03-06
Implemented on:	2021-02-01
Superseding:	GB/T 7964-1987 Sintered metal materials(excluding hardmetal); Tension testing at room temperature
Professional Classification:	GB-National Standard
Related Keywords:	sintered metal materials core test requirements test parameters requirements room temperature introduction background old standard test data quantified yield strength ≤0.0008s⁻¹tensile strength ≤0.0024s⁻¹ introduction
Related Topics:	Material is not up to standard Organic Non-metallic Materials Laboratory Room temperature English Metal materials include laboratory material The material structure includes 6 metal stretching machine metal stretching machine light alloy material Non-metallic Materials Laboratory Tensile specimens of sintered metal materials The structure of the material includes metal stretching agent Laboratory extensometer What are the heavy metals Metallic materials include metals and Metal Labs Nearby metal laboratory Room temperature stretching and high temperature stretching Laboratory extensometer metal stretch box heavy metals not included light alloy material Stretching method of metal material at room temperature Stretch at room temperature Extensometer Laboratory Tensile test method for metallic materials at room temperature Metal tensile basis GBT7964 GB/T 7964-1987 GB/T 7964-2020 Sintered metal material Carbide Stretching test What is plastic alloy material HB5143 metal room temperature stretching Sheet metal tensile testing rate of reduction in area room temperature Metal drawing industry Non-metal tensile test

《GB/T 7964-2020烧结金属材料（不包括硬质合金）室温拉伸试验》由TC243（全国有色金属标准化技术委员会）归口，TC243SC4（全国有色金属标准化技术委员会粉末冶金分会）执行，主管部门为中国有色金属工业协会。

Introduction

Background of Standard Revision and Technological Evolution

As an alternative version of GB/T7964-1987, this standard reflects the development trend of metal material testing technology in the past 30 years:

Terminology system update: "yield point" is changed to "yield strength", "elongation" is changed to "elongation after fracture", etc., to keep the terminology consistent with the international standard ISO6892-1
Test automation: It is clearly stated that computers are used to automatically record load-deformation curves, and pointer-type force measuring devices are eliminated
Accuracy improvement: The dimensional measurement accuracy is increased from 0.02mm to 0.01mm, and the extensometer accuracy requirement is Class 1 and above

Analysis of core test requirements

Test parameters	Requirements of the 1987 version	New regulations of the 2020 version	Technical differences
Testing machine accuracy	Unclear classification	Grade 1 or better than Grade 1	Quoted GB/T16825.1 calibration specification
Strain rate control	Not specifically quantified	Yield strength ≤0.0008s⁻¹ Tensile strength ≤0.0024s⁻¹	Introduction of strain rate sensitive control
Data rounding rules	Refer to GB1.1-81	Strength value is rounded off to 1MPa Area is rounded off by segment	Detailed numerical processing specifications

Key points of the test process

Specimen preparation

Specimens are processed according to GB/T7963. Special attention should be paid to the following:

Original gauge length is 25.0mm±0.1mm
The cross-sectional area is measured at the minimum of three points. The flat specimen is calculated using formula (1) and the cylindrical specimen is calculated using formula (2)
There should be no visible processing defects on the surface

Equipment configuration requirements

Clamp system: Wedge-type/collar chucks must ensure that the specimen axis is aligned
Extensometer: Grade 1 accuracy, gauge length ≥ 1/2 of the gauge length of the specimen
Environmental control: Room temperature 10-35℃, special circumstances need to be noted

Implementation suggestions and common problems

Operational precautions

1. Rate control: It is recommended to use the strain control mode first, and the crossbeam displacement rate is converted according to vc=εLe×Lc
2. Fracture position: The fracture data outside the gauge length is invalid and needs to be resampled and tested
3. Data processing: When calculating the cross-sectional shrinkage rate, the cylindrical specimen needs to measure the diameters of the two perpendicular directions at the necking point

Transition from old to new standards

Laboratories should focus on:
- Update the terminology system in the report template
- Verify the existing class=instrument>Whether the test machine system meets the requirements of Class 1 accuracy
- Comparison of the difference between the new and old standard test data

More samples: JJG 21-2008 JC/T 2453-2018 DL/T 5154-2012

Sample only — not a preview of GB/T 7964-2020

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