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Steel Grades Glossary (ASTM / JIS / EN / GB)
A practical grade-mapping reference for export buyers comparing common structural, coil and pipe grades across major standards.
Structural Carbon Steel Mapping
| GB |
EN |
ASTM |
Typical use |
| Q235B |
S235JR |
A36 (approx.) |
General structural fabrication |
| Q355B |
S355JR |
A572 Gr.50 (approx.) |
Higher-strength frames & H-beam |
Coil & Coated Steel Mapping
| Family |
EN / JIS / GB |
Notes |
| HRC |
SAE1006 / Q235B / S235JR |
Confirm chemistry window and thickness tolerance before order |
| GI Coil |
DX51D+Z / SGCC |
Lock zinc coating (e.g. Z120–Z275) and surface finish |
Pipe Grade Examples
- ASTM A106 Gr.B — seamless carbon steel pipe for high-temperature service
- API 5L Gr.B — line pipe for oil/gas and transmission projects
- Always verify OD/WT, end finish and NDT scope against project specs
Selection Tips for Buyers
- Equivalent grades are approximate — lock acceptance criteria in the PO.
- Mechanical properties and impact requirements can differ even when names look similar.
- Share destination standard first; we recommend mill grades that pass local inspection.
HRC Product |
GI Product |
Structural Steel |
Grade Mapping Insight |
Export FAQ