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EXECUTIVE SUMMARY
This report covers GB/T 10433-2024 (紧固件 电弧螺柱焊用螺柱和瓷环 — Fasteners: studs and ceramic ferrules for arc stud welding), the mandatory-updated Chinese product standard for shear studs in composite steel-concrete structures. The standard is MOD relative to ISO 13918:2017, with near-identical dimensional and mechanical requirements but divergent material grades and testing protocols. Procurement implication: studs certified to GB/T 10433-2024 will generally satisfy ISO 13918:2017 dimensional checks, but material certification and weldability testing must be re-verified for EU/US projects.
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB/T 10433-2024 | 紧固件 电弧螺柱焊用螺柱和瓷环 (Fasteners: studs and ceramic ferrules for arc stud welding) | Product standard: dimensions, materials, mechanical properties for d=10–25mm studs | Recommended (GB/T) | Current |
| GB/T 10433-2002 | 电弧螺柱焊用圆柱头焊钉 (Cylindrical head studs for arc stud welding) | Superseded product standard | Recommended | Superseded by 2024 edition |
| GB 50661-2011 | 钢结构焊接规范 (Code for welding of steel structures) | Installation/welding acceptance | Mandatory (GB) | Current |
| GB 50017-2017 | 钢结构设计标准 (Standard for design of steel structures) | Design code: shear connector capacity | Mandatory (GB) | Current |
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| GB/T 10433-2024 | TIER 1 — Product Standard | Defines stud dimensions, materials, mechanical properties |
| ISO 13918:2017 | TIER 1 — Product Standard | International equivalent product standard |
| ASTM A1084-15a | TIER 1 — Product Standard | US headed steel stud specification |
| GB 50661-2011 | TIER 3 — Installation Code | Governs on-site stud welding verification |
| GB 50017-2017 | TIER 3 — Design Code | Shear connector capacity design |
No tier mismatch — all product standards compared at TIER 1.
SCOPE BREAKDOWN
Shear studs (焊钉/螺柱) — d=10–25mm
Chinese standard: GB/T 10433-2024: 紧固件 电弧螺柱焊用螺柱和瓷环 (Fasteners: studs and ceramic ferrules for arc stud welding)
International equivalent: ISO 13918:2017: Welding — Studs and ceramic ferrules for arc stud welding — ⚠️ GB/T 10433-2024 aligns to ISO 13918:2017, not the 2005 edition
Equivalence: MOD
Standard tier match: Both TIER 1 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Diameter range | 10–25mm (GB/T 10433-2024 §4) | 10–25mm (ISO 13918:2017 §4) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Head type | Cheese head (圆柱头) (GB/T 10433-2024 §4) | Type SD cheese head (ISO 13918:2017 §4) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Tensile strength | ≥400 MPa [Verify: GB/T 10433-2024 ~§5.3] | ≥450 MPa (ISO 13918:2017 §5.3) | −11% | 附加测试后互认 (Mutual recognition after additional testing) | HIGH |
| Chemical composition | Chinese steel grades (e.g. ML15) [Verify: GB/T 10433-2024 ~§5.1] | Specified per ISO (ISO 13918:2017 §5.1) | Different material designations | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
| Bend test | 30° bend, no crack [Verify: GB/T 10433-2024 ~§6.4] | 30° bend, no crack (ISO 13918:2017 §6.4) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Weldability test | Required per GB 50661-2011 | Required per ISO 13918:2017 Annex A | Different test methods | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
KEY DIFFERENCES SUMMARY
- Tensile strength: GB/T 10433-2024 requires ≥400 MPa vs ISO 13918:2017 ≥450 MPa (−11%). Verdict: 附加测试后互认 (Mutual recognition after additional testing). Impact: HIGH — affects shear connector design capacity per GB 50017-2017.
- Material grades: Chinese ML15/ML20 steel designations differ from ISO-specified grades. Verdict: 附加测试后互认 (Mutual recognition after additional testing). Impact: MEDIUM.
- Edition alignment: GB/T 10433-2024 now aligns to ISO 13918:2017 (previously 2005 edition). Verdict: 直接互认 (Direct mutual recognition) for dimensions. Impact: LOW.
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | None (GB/T is recommended; no CCCF required) | CE marking per EN ISO 13918:2017; ASTM F1554 for US |
| Engineering acceptance inspection | GB 50661-2011 (welding acceptance) | EN 1994-1-1 (Eurocode 4) installation sections |
| Import/export compliance | CCIB commodity inspection | Destination country customs standard |
| Designer/engineer obligation | GB 50017-2017 (钢结构设计标准 — steel structure design) | Eurocode 4 / AISC 360 |
AUDIT FLAG RESOLUTION
- ✅ RESOLVED: Standard edition — GB/T 10433-2024 is CURRENT (现行), superseding GB/T 10433-2002. Both AI drafts cited outdated 2002/2010 editions.
- ✅ RESOLVED: ISO alignment — GB/T 10433-2024 aligns to ISO 13918:2017, not the 2005 edition cited in Answer A.
- ⚠️ UNRESOLVED: Tensile strength value — verify against GB/T 10433-2024 §5.3 (official text required).
PROCUREMENT VERDICT
- Confirm studs are certified to GB/T 10433-2024 (not 2002 edition) — verify marking.
- Request material test certificates showing chemical composition and tensile strength ≥400 MPa.
- For EU projects: require EN ISO 13918:2017 compliance testing — Chinese certification alone insufficient.
- Verify weldability test reports per GB 50661-2011 before site acceptance.
- Check design capacity calculations use correct fu value per GB 50017-2017.
- Obtain ISO 13918:2017 bend test certificate if exporting to ISO-regulated markets.
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB/T 10433-2024 §5.3 — tensile strength verification
- GB/T 10433-2024 §5.1 — chemical composition requirements
- GB/T 10433-2024 §6.4 — bend test procedure
- ISO 13918:2017 §5.3 — tensile strength comparison
- GB 50661-2011 §[Verify] — stud welding acceptance criteria
FIELD INSPECTION CHECKLIST
- Verify stud head marking shows GB/T 10433-2024 compliance
- Measure diameter and head dimensions with calibrated micrometer
- Witness bend test on 3 samples per batch
- Check ceramic ferrule condition — no cracks or moisture damage
- Confirm material certificate matches heat number on studs
- Verify weld test reports match batch numbers
CONFIDENCE RATING
🟡 MEDIUM CONFIDENCE — core data verified across two AI sources and official standard registry; tensile strength value and chemical composition clauses flagged for official text confirmation.
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