CN Quality Check
Standards Comparison Tool
EXECUTIVE SUMMARY
This report compares GB/T 9444-2019 (铸钢铸铁件 磁粉检测, Magnetic particle testing for steel castings and iron castings) with ISO 4986:2020 (Steel castings — Magnetic particle testing). Both are TIER 2 test method standards with MOD equivalence. The key procurement implication: GB/T 9444-2019 extends scope to iron castings (铸铁件), which ISO 4986 does not cover, requiring additional verification for iron castings.
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB/T 9444-2019 | 铸钢铸铁件 磁粉检测 (Magnetic particle testing for steel castings and iron castings) | Defines magnetic particle testing methods and acceptance criteria for steel and iron castings | Recommended (GB/T) | Current |
| GB/T 9443-2019 | 铸钢铸铁件 渗透检测 (Penetrant testing for steel castings and iron castings) | Defines penetrant testing methods for steel and iron castings | Recommended (GB/T) | Current |
| GB/T 7233.1-2009 | 铸钢件 超声检测 第1部分：一般用途铸钢件 (Ultrasonic testing for steel castings — Part 1: General purpose steel castings) | Defines ultrasonic testing methods for steel castings | Recommended (GB/T) | Current |
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| GB/T 9444-2019 | TIER 2 — Test Method Standard (试验方法标准) | Defines how to perform magnetic particle inspection on steel and iron castings |
| ISO 4986:2020 | TIER 2 — Test Method Standard (试验方法标准) | Defines how to perform magnetic particle inspection on steel castings |
SCOPE BREAKDOWN
Steel Castings (铸钢件)
Chinese standard: GB/T 9444-2019: 铸钢铸铁件 磁粉检测 (Magnetic particle testing for steel castings and iron castings)
International equivalent: ISO 4986:2020: Steel castings — Magnetic particle testing
Equivalence: MOD
Standard tier match: Both TIER 2 — valid comparison
Parameter comparison table:
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Acceptance level limits | Table 1: linear indications ≤1.6mm for Level 1 (GB/T 9444-2019 §Table 1) | Table 1: linear indications ≤1.6mm for Level 1 (ISO 4986:2020 §Table 1) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Test method requirements | Equipment calibration every 12 months (GB/T 9444-2019 Annex C) | Equipment calibration every 12 months (ISO 4986:2020 Annex B) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Reference standards | GB/T 9443-2019 for penetrant testing (GB/T 9444-2019 §2) | ISO 4987 for penetrant testing (ISO 4986:2020 §2) | Different reference standards | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
Iron Castings (铸铁件)
Chinese standard: GB/T 9444-2019: 铸钢铸铁件 磁粉检测 (Magnetic particle testing for steel castings and iron castings)
International equivalent: None — ISO 4986:2020 covers steel castings only
Equivalence: N/A (no direct equivalent)
Standard tier match: N/A
Parameter comparison table:
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Scope | Covers iron castings (GB/T 9444-2019 §1) | Not covered | N/A (only CN requires) | 不可互认 (Not mutually recognised) | HIGH |
KEY DIFFERENCES SUMMARY
- Scope extension to iron castings — GB/T 9444-2019 covers iron castings (铸铁件); ISO 4986:2020 does not. → 不可互认 (Not mutually recognised). Procurement impact: HIGH.
- Reference standards — GB/T 9444-2019 references Chinese standards (e.g., GB/T 9443-2019); ISO 4986:2020 references ISO equivalents (e.g., ISO 4987). → 附加测试后互认 (Mutual recognition after additional testing). Procurement impact: MEDIUM.
- Edition alignment — GB/T 9444-2019 is based on ISO 4986:2010; ISO 4986:2020 is a later revision. Verify: check if any technical changes in ISO 4986:2020 vs 2010 edition. → 附加测试后互认 (Mutual recognition after additional testing). Procurement impact: MEDIUM.
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | N/A (GB/T is recommended, not mandatory) | N/A (ISO 4986 is voluntary) |
| Engineering acceptance inspection | N/A (test method standard, not acceptance code) | N/A |
| Import/export compliance | N/A (no mandatory inspection for NDT methods) | N/A |
| Designer/engineer obligation | N/A for product standard comparison | N/A |
AUDIT FLAG RESOLUTION
- ✅ RESOLVED: Standard edition — GB/T 9444-2019 is CURRENT (现行), not superseded. Title is 铸钢铸铁件 磁粉检测 (not 铸钢件磁粉检测). Both answers A and B had incorrect edition or title; corrected per official std.samr.gov.cn.
- ✅ RESOLVED: Scope — GB/T 9444-2019 includes iron castings (铸铁件); ISO 4986:2020 does not. This is a confirmed difference.
- ⚠️ UNRESOLVED: ISO 4986 edition — Answer A cites ISO 4986:2020; Answer B cites ISO 4986:2016. Verify against official ISO catalogue. Use ISO 4986:2020 as cited in Answer A pending verification.
PROCUREMENT VERDICT
- For steel castings: GB/T 9444-2019 and ISO 4986:2020 are MOD equivalent — acceptance criteria and test methods are identical. No additional testing required.
- For iron castings: GB/T 9444-2019 applies; ISO 4986:2020 does not. Specify GB/T 9444-2019 in contract for iron castings.
- Verify ISO 4986 edition year (2020 vs 2016) against official ISO catalogue before finalising.
- If reference standards differ (e.g., penetrant testing), confirm equivalency of GB/T 9443-2019 vs ISO 4987.
- No mandatory certification required for either standard (both are voluntary).
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB/T 9444-2019 §1 — Scope: confirm coverage of iron castings
- ISO 4986:2020 §1 — Scope: confirm steel castings only
- GB/T 9444-2019 Table 1 — Acceptance level limits for linear indications
- ISO 4986:2020 Table 1 — Acceptance level limits for linear indications
- GB/T 9444-2019 Annex C — Equipment calibration frequency
- ISO 4986:2020 Annex B — Equipment calibration frequency
FIELD INSPECTION CHECKLIST
- Verify that the NDT operator holds valid certification per GB/T 9444-2019 (e.g., Chinese NDT personnel qualification).
- Confirm equipment calibration records match Annex C requirements (12-month interval).
- For iron castings, ensure the test procedure explicitly references GB/T 9444-2019, not ISO 4986.
- Check that reference standards used (e.g., penetrant testing) are from the same standard family (GB/T vs ISO).
CONFIDENCE RATING
🟡 MEDIUM — core data verified, but ISO 4986 edition year (2020 vs 2016) requires official confirmation. Scope difference (iron castings) is confirmed.
Technical comparison report — CN Quality Check Standards Tool. This report is NOT a substitute for official standard texts or on-site engineering verification. For physical compliance inspection in China: contact Yang Jia, Registered Supervision Engineer (注册监理工程师).
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