GB/T 38430-2019 in English
VALIDCorrosion of metals and alloys—Test method for isothermal-exposure oxidation testing under high-temperature corrosion conditions for metallic materials
- Issued on:2019-12-31
- Implemented on:2020-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 38430-2019金属和合金的腐蚀 金属材料在高温腐蚀条件下的等温暴露氧化试验方法》由TC183（全国钢标准化技术委员会）归口，TC183SC11（全国钢标准化技术委员会金属和合金的腐蚀分会）执行，主管部门为中国钢铁工业协会。
Introduction
Interpretation of the core content of the standard
GB/T38430-2019 specifies the isothermal exposure oxidation test method for metal materials in a high temperature corrosion environment, which is suitable for evaluating the oxidation behavior of materials under continuous/discontinuous exposure conditions. The standard technical framework consists of 8 core chapters and 3 appendices, focusing on the following:
| Technical elements | Specific requirements | Comparison with international standards |
|---|---|---|
| Test temperature control | Deviation range ±2℃ (≤300℃) to ±7℃ (1000-1200℃) | Consistent with ISO21608 |
| Specimen preparation | Surface area ≥300mm², surface roughness Ra≤15μm | Add P1200 abrasive requirements |
| Gas environment | Recommended specific humidity of 20g/kg, flow replacement rate ≥3 times/h | Supplementary non-closed system specifications |
| Quality analysis | Distinguish between gross change (Δmgross) and net change (Δmnet) | The calculation formula is clearer |
Key technical differences
Structural optimization: Split the "Test Equipment" chapter in the ISO standard into two chapters, "Equipment" and "Gas Supply", with clearer logic. Added Figures 2-4, three types of sample holder design schematics, to provide reference for the test of special-shaped parts such as aircraft engine blades.
Localization improvement: Added GB/T9258.3-2017 abrasive standard in the normative reference documents, and clearly used domestic P1200 abrasive for sample surface treatment to ensure test repeatability.
Key points for implementation
- Equipment selection: For closed systems, corundum sample chambers are preferred. For non-closed systems, temperature and humidity recording devices shall be provided.
- Process control: Thermocouples shall be calibrated regularly according to JJG141. Type S thermocouples are suitable for tests below 1100℃.
- Data validity: Two parallel samples are required for each exposure time point, and the weighing error shall be ≤0.05mg.
- Safety warning: When taking out the sample, inert gas shall be passed to prevent oxide scale splashing.
Application case
In a 900℃ air environment test, a nickel-based high-temperature alloy was measured using a continuous exposure mode:
- The mass increase in 100h was 1.2mg/cm² (protective oxidation stage)
- After 300h, oxide scale peeling occurred and the net change turned negative.
- Internal oxidation was confirmed by metallographic examination in Appendix A.
Analysis of Standard Evolution
This standard is modified and adopted based on ISO21608:2012. The main technical differences are as follows:
- Increase the reference to domestic thermocouple standard GB/T1598
- Detail the design requirements of the specimen holder (add 3 new structural drawings)
- Strengthen the humidity control requirements and clarify the 25℃ dew point standard
- Add the special case of rod support type to the mass change calculation formula
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
GB/T 20854-2025 in English
Corrosion of metals and alloys—Accelerated testing involving cyclic exposure to salt mist, “dry”and“wet”conditions
2025-04-25 -
GB/T 32550-2016 in English
Corrosion of metals and alloys―Determination of the critical pitting temperature under potentiostatic control
2016-02-24 -
GB/T 20853-2026 in English
Corrosion of metals and alloys—Corrosion in artificial atmosphere—Accelerated corrosion test involving exposure under controlled conditions of humidity cycling and intermitted spraying of a salt solution
2026-02-27 -
GB/T 19745-2005 in English
Corrosion tests in artificial atmosphere at very low Concentrations of polluting gas(es)
2005-05-13 -
GB/T 33883-2017 in English
Test methods for stress corrosion of 7××× series aluminum alloys--Boiling sodium chloride solution method
2017-07-12 -
GB/T 34203-2017 in English
Corrosion of metals and alloys--Air pollutant monitoring and analysis methods
2017-09-07 -
GB/T 15260-2016 in English
Standard Test Method for Intergranular Corrosion of Nickel Alloys by Corrosion of Metals and Alloys
2016-08-29 -
GB/T 46613-2025 in English
Corrosion of metals and alloys—Test and evaluation for the corrosion of steel bar embedded in concrete structure exposed to total corrosion zones in marine environments
2025-10-31 -
GB/T 36174-2018 in English
Corrosion of metals and alloys—Determination of resistance to intergranular corrosion of solution heat-treatable aluminium alloys
2018-05-14 -
GB/T 15970.1-2018 in English
Corrosion of metals and alloys—Stress corrosion testing—Part 1:General guidance on testing procedures
2018-05-14
