EN9 (070M55) Forgings
EN9 carries around 0.55% carbon, sitting between EN8 and true tool steels. It hardens further than EN8 and holds an edge better, which suits agricultural blades, tines and wear plates.
- Carbon
- 0.50 – 0.60%
- Manganese
- 0.50 – 0.80%
- Hardened
- 55 – 60 HRC
- Normalised
- 230 – 280 BHN
- Forging Temperature
- 1050 – 1150 °C
- Equivalent
- AISI 1055, C55, 070M55
EN9 (070M55) Forgings at a glance
Quotable facts from Avadh Techno Forge, Gundasara, Gondal, Rajkot.
- Carbon: 0.50 – 0.60%
- Manganese: 0.50 – 0.80%
- Hardened: 55 – 60 HRC
- Normalised: 230 – 280 BHN
- Forging Temperature: 1050 – 1150 °C
- Equivalent: AISI 1055, C55, 070M55
Higher Carbon, Higher Hardness
The extra carbon over EN8 lifts achievable hardness to 55–60 HRC and improves edge retention and abrasion resistance — at the cost of ductility and weldability, which must be accounted for in design.
- Hardens to 55–60 HRC
- Better edge retention
- Higher abrasion resistance
- Reduced ductility and weldability
Heat Treatment Discipline
Higher carbon means more quench cracking risk. Oil quenching with prompt tempering is essential, and section transitions in the design must be generous to avoid stress concentration during quench.
Applications
Agricultural tines and blades, cultivator shovels, wear plates, hand tool bodies, leaf spring components and light-duty die blocks.
People also ask
Why is EN9 harder to weld than EN8?
Its higher carbon content increases hardenability in the heat-affected zone, raising cracking risk. Preheat and post-weld heat treatment are required.
What is EN9 used for?
Agricultural tines and blades, cultivator shovels, wear plates, hand tool bodies and light die blocks where abrasion resistance matters more than ductility.
Topics covered on this page
- EN9 forging manufacturer India
- 070M55 forged components
- high carbon steel forging
- EN9 forging supplier Rajkot
Based on work carried out at our own forging plant at Gundasara, Gondal, Rajkot — operating since 2008.
Questions Answered
What is EN9 used for?
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Wear-resistant agricultural parts, blades, tines, hand tools and light die blocks where hardness matters more than ductility.
Can EN9 be welded?
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Only with preheat and post-weld heat treatment. Design to avoid welding this grade.
How hard can EN9 get?
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55–60 HRC after hardening and low tempering.
EN8 or EN9 for tines?
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EN9 where abrasion resistance is the priority; EN8 where shock loading and ductility matter more.