EN353 / 20CrNiMo5
Qilu
Product Description
Hot rolled and forged EN353 round bar supplied annealed for carburizing, 15 mm to 400 mm diameter, with rough machining and ultrasonic testing done in-house.
Equivalent to: BS EN353 · ~DIN 20NiCrMo5 (1.6654) · close to AISI 8620 with higher Ni · GB 20CrNiMo
Alloy Engineering Steel EN353 20CrNiMo5 Hot Rolled Bars
Alloy Engineering Steel EN353 20CrNiMo5 Hot Rolled Bars
Alloy Engineering Steel EN353 20CrNiMo5 Hot Rolled Bars
Supply form — Round bar, forgings, blanks
Process — Hot rolled / hot forged
Condition — Annealed for carburizing (≤ 229 HB)
Diameter range — 15–400 mm
Standard — BS 970 EN353 / GB GB/T 3077 (20CrNiMo close)
Certificate — EN 10204 3.1 standard, 3.2 on request
Lead time — 20–35 days
EN353 is a British Standard case-hardening Ni-Cr-Mo steel. With higher nickel than 8620 it develops a tougher core after carburizing — the standard grade for crown wheels, differential gears and shafts that take a hard wear-resistant case over a shock-resistant core.
| Element | C | Si | Mn | P (max) | S (max) | Ni | Cr | Mo |
|---|---|---|---|---|---|---|---|---|
| BS 970 EN353 (typical) | 0.17–0.22 | 0.10–0.35 | 0.50–0.80 | 0.035 | 0.035 | 1.30–1.70 | 0.80–1.10 | 0.15–0.25 |
Properties show the annealed bar and typical case-hardened performance.
| Property | Annealed bar | Case-hardened (typical) |
|---|---|---|
| Tensile strength, Rm (MPa) | ≤ 640 | ≥ 1000 (core) |
| Yield strength, Re (MPa) | ≤ 400 | ≥ 800 (core) |
| Elongation, A5 (%) | ≥ 15 | ≥ 8 (core) |
| Impact, KV (J) | ≥ 40 | ≥ 35 (core) |
| Surface hardness | ≤ 229 HB | 58–63 HRC (case) |
| Standard | Designation |
|---|---|
| BS (UK) | EN353 |
| DIN (Germany) | ~20NiCrMo5 / 1.6654 (close) |
| ASTM (USA) | ~8622 (close, higher Ni than 8620) |
| GB (China) | 20CrNiMo |
| Werkstoff Nr. | 1.6654 (close) |
Gears — crown wheels, differential gears, pinions
Automotive — transmission shafts, splined hubs
Bearings — heavy-duty races and rollers
Heavy equipment — king pins, bushings, clutch parts
EN353 is carburized at 900–925 °C, then quenched and tempered at 150–200 °C to reach 58–63 HRC on the case over a tough Ni-rich core. The grade is supplied annealed; for repeat gear production we can supply pre-rough-machined blanks cut to your gear blank size.
Most suppliers in this business are traders who subcontract everything. We run our own processes, which means shorter cycles and one point of accountability when something needs fixing.
Heat treatment shop — quenching and tempering to your target hardness, with furnace charts recorded per batch
Machining shop — rough turning, peeling and cutting to length, so your bar arrives ready for finish machining
Testing — ultrasonic per ASTM A388 / EN 10228-3, hardness mapping across the section, tensile and impact testing
Certification — EN 10204 3.1 as standard, 3.2 available with third-party witness (ABS, BV, CCS, GL)
Export packing — bundled, end-capped and rust-protected for sea freight
EN353 has higher nickel (~1.5 % vs ~0.55 % for 8620), giving a tougher core for heavily loaded gears. 8620 is the economical case-hardening grade; EN353 is used where shock loading on the core is severe.
Yes. We rough-turn and cut to length so you receive blanks ready for carburizing. This reduces material loss and machining time in your shop.
EN 10204 3.1 mill certificate as standard, showing heat analysis and mechanical test results. 3.2 with third-party witness (ABS, BV, CCS, GL) is available on request.
Send us your diameter, length, quantity, required hardness and destination port. You will get a quotation with the full technical proposal within 24 hours.
Email: enquiry@qilumetal.com | Web: www.qilumetal.com
