20Mn
Data verified20Mn is the high-manganese variant of grade 20 in GB/T 699: the same low carbon but 0.70–1.00% manganese for higher strength and hardenability while staying weldable.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.17–0.23 |
| Si | 0.17–0.37 |
| Mn | 0.70–1.00 |
| P | ≤0.035 |
| S | ≤0.035 |
| Cr | ≤0.25 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Density | 7.85 g/cm³ |
| Weldability | Good |
| Note | Higher as-rolled strength than grade 20 at the same carbon level (Mn 0.70–1.00%) |
Heat treatment
Used as-rolled or normalized; carburizable.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | 1022 (near) |
| gb | 20Mn (GB/T 699) |
Compare side by side: 20Mn vs 1022
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Carburized parts, chains, bolts, shafts needing more than grade-20 strength.
Processing: Good machinability and weldability; the Chinese counterpart of the 1022 concept.
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Ask for a quotationVisit NasteelSource: GB/T 699-2015 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.