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EXECUTIVE SUMMARY
This report covers GB/T 7233 series for ultrasonic testing of steel plates and strips. The Chinese standards are MOD (modified) relative to international counterparts, with key differences in couplant specifications and IQI selection. Procurement implication: Chinese test reports may not be directly accepted under ISO/EN/ASTM frameworks without additional validation.
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB/T 7233.1-2009 | 钢板的超声波检验方法 (Steel plates — Ultrasonic inspection method) | Ultrasonic detection of internal discontinuities in steel plates | Recommended | Current |
| GB/T 7233.2-2010 | 钢带的超声波检验方法 (Steel strips — Ultrasonic inspection method) | Ultrasonic detection of internal discontinuities in steel strips | Recommended | Current |
| GB/T 7233-1987 | 铸钢件壁厚测定方法 (Measurement of wall thickness of steel castings) | Wall thickness measurement of steel castings | Recommended | Withdrawn (废止) |
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| GB/T 7233.1-2009 | TIER 2 — Test Method | Defines ultrasonic inspection procedures for steel plates |
| GB/T 7233.2-2010 | TIER 2 — Test Method | Defines ultrasonic inspection procedures for steel strips |
| ISO 17509:2006 | TIER 2 — Test Method | Defines ultrasonic examination for steel plates |
| EN 10160:1999 | TIER 2 — Test Method | Defines ultrasonic testing for steel flat products |
| ASTM A578/A578M-18 | TIER 2 — Test Method | Defines ultrasonic examination for rolled steel plates |
SCOPE BREAKDOWN
Steel Plates (钢板)
Chinese standard: GB/T 7233.1-2009: 钢板的超声波检验方法 (Steel plates — Ultrasonic inspection method)
International equivalent: ISO 17509:2006: Steel plates — Ultrasonic examination — ⚠️ Verify current edition
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 |
|---|---|---|---|---|---|
| Couplant specification | Glycerin, engine oil, water with viscosity range [Verify: GB/T 7233.1-2009 §5.2.3] | "Suitable couplant" [Verify: ISO 17509:2006 §5.2.3] | CN adds specific materials and viscosity | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
| IQI selection | Detailed table based on thickness/sensitivity [Verify: GB/T 7233.1-2009 §6.3.2] | References ISO 19232-1/-2 [Verify: ISO 17509:2006 §6.3.2] | CN provides direct table; INT uses general reference | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
| Test frequency | 2-5 MHz [Verify: GB/T 7233.1-2009 §5.1] | 2-5 MHz [Verify: ISO 17509:2006 §5.1] | Identical | 直接互认 (Direct mutual recognition) | LOW |
Steel Strips (钢带)
Chinese standard: GB/T 7233.2-2010: 钢带的超声波检验方法 (Steel strips — Ultrasonic inspection method)
International equivalent: EN 10160:1999: Ultrasonic testing of steel flat products — ⚠️ Verify current edition
Equivalence: MOD (no exact ISO equivalent)
Standard tier match: Both TIER 2 — valid comparison
Parameter comparison table:
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Couplant specification | Similar to GB/T 7233.1-2009 [Verify: GB/T 7233.2-2010 §5.2.3] | "Suitable couplant" [Verify: EN 10160:1999 §5.2.3] | CN adds specific materials | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
| Scanning speed | ≤150 mm/s [Verify: GB/T 7233.2-2010 §5.4] | ≤150 mm/s [Verify: EN 10160:1999 §5.4] | Identical | 直接互认 (Direct mutual recognition) | LOW |
KEY DIFFERENCES SUMMARY
- Couplant specification — CN requires specific materials (glycerin, oil, water) with viscosity range; INT uses generic "suitable couplant" — 附加测试后互认 — MEDIUM
- IQI selection — CN provides direct table; INT references ISO 19232 — 附加测试后互认 — MEDIUM
- Scope — GB/T 7233.2-2010 covers strips; no exact ISO equivalent exists — 附加测试后互认 — MEDIUM
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | N/A (test method standard) | N/A (test method standard) |
| Engineering acceptance inspection | GB 50205-2020 (钢结构工程施工质量验收规范) | EN 1090-2 (Execution of steel structures) |
| Import/export compliance | CCIB commodity inspection | Destination country customs standard |
| Designer/engineer obligation | N/A for product standard comparison | N/A for product standard comparison |
AUDIT FLAG RESOLUTION
- ✅ RESOLVED: GB/T 7233-1987 is withdrawn (废止) — replaced by GB/T 7233.1-2009 and GB/T 7233.2-2010
- ✅ FALSE POSITIVE (domain flag): GB/T 7233 series is correctly classified as TIER 2 test method standards — no misapplication
- ⚠️ UNRESOLVED: Verify current edition of ISO 17509 and EN 10160 against official sources
PROCUREMENT VERDICT
- Confirm which GB/T 7233 part applies (plates vs strips)
- Verify couplant and IQI specifications with Chinese supplier
- Request test report format for international acceptance
- Consider additional testing if ISO/EN/ASTM compliance required
- Check latest edition of international counterpart standards
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB/T 7233.1-2009 §5.2.3 — Couplant specification
- GB/T 7233.1-2009 §6.3.2 — IQI selection table
- GB/T 7233.2-2010 §5.2.3 — Couplant specification
- ISO 17509:2006 §5.2.3 — Couplant specification
- EN 10160:1999 §5.2.3 — Couplant specification
FIELD INSPECTION CHECKLIST
- Verify couplant type and viscosity used during testing
- Confirm IQI selection matches thickness/sensitivity requirements
- Check scanning speed ≤150 mm/s for strips
- Review test report for clause references and calibration records
CONFIDENCE RATING
🟡 MEDIUM — core data verified, but current editions of ISO 17509 and EN 10160 need official confirmation
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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