Grade Designations.
| BS EN 10277:2018 | C22E / 1.1151 |
| BS 970:1991 (withdrawn) | 070M20 |
| AISI/SAE | 1020 / 1023 |
| DIN | C22 / 1.0402 |
| ISO | C22E |
Availability & Supply Condition.
Rounds: Metric 3–310mm | Squares: Metric 8–150mm | Hexagons: Metric 5–75mm AF | Flats: wide range
Supply condition: Bright Drawn (cold drawn) or Bright Turned. Supplied in the as-drawn condition.
Cut to length from 1 piece — −0/+2mm standard tolerance — 2–3 day turnaround — Cutting service details ›
Chemical Analysis.
Values shown as percentages by weight (% wt). Values are ranges unless stated as maxima.
| Designation | C | Si | Mn | P max | S max |
|---|---|---|---|---|---|
| 070M20 | 0.16–0.24 | 0.10–0.40 | 0.50–0.90 | 0.05 | 0.05 |
| C22E | 0.17–0.23 | 0.17–0.37 | 0.40–0.70 | 0.035 | 0.035 |
For full chemical analysis with heat number, request an EN 10204 3.1 material test certificate when ordering — available on all alloy grades. Certificate types explained ›
Mechanical Properties.
Values shown for standard supply condition. Properties vary by section size and heat treatment condition.
| Condition | Size (mm) | Tensile Rm (N/mm²) | Yield Re (N/mm²) | A% min |
|---|---|---|---|---|
| CD (Bright) | ≤16 / >16–40 / >40–100 | 430–590 / 410–560 / 390–540 | ~240 / ~215 / ~195 | 20 / 21 / 22 |
Hardness values: see our hardness conversion table to convert between HRC, HB, HV and tensile strength.
Typical Applications.
- General-purpose engineering shafts (light duty)
- Keys, studs, pins and cotters
- Welded assemblies and fabrications
- Case carburised components — pins, cams, rollers
- Woodruff keys and keyways
Key Benefits.
- Good weldability — all conventional processes
- Good machinability in bright drawn condition
- Available in wide range of sizes and profiles
- Case carburisable for improved surface hardness
- Cost-effective for light engineering applications
Remarks & Guidance.
Not suitable for through-hardening but responds well to case carburising. Good weldability using MIG, TIG, MMA and resistance welding processes. No preheat normally required for sections up to 25mm. Not to be confused with 210M15 (EN32M) / 080A15 (EN32B), dedicated case hardening grades with tighter carbon control.
Relevant Heat Treatment Processes.
This grade responds to the following heat treatment processes. Click any card for temperatures, cooling methods and expected hardness values.
