Alloy Through-hardening, Case-hardening & Nitriding steels

Depending on the type and amount of alloying elements used, the steel will be fully hardenable (i.e. through-hardening) to various ruling sections. Through-hardening alloy steels will usually also have a Carbon content >0.30%.

Different alloy steel grades can also be supplied with lower levels of Carbon (typically between 0.15 - 0.30%) to allow them to be subsequently Case-hardened, whilst still maintaining the core strength and toughness deriving from the base alloy content.

An alternative to Case-hardening with Carbon, is Nitriding i.e. diffusing Nitrogen into the surface layers of the steel. A further range of alloy steel grades containing higher levels of Aluminium or Chromium is also available for these applications.

Controlled additions of Sulphur can be made to improve the machinability of the grade.

The properties of alloy steels are usually developed by suitable heat treatment e.g. hardening and tempering.

We supply:

• Silicon-Manganese alloys (SiMn)
• Silicon-Chromium alloys (SiCr)
• Chromium & High-Carbon Chromium alloys (Cr)
• Manganese Molybdenum alloys (MnMo)
• Chromium-Molybdenum alloys (CrMo)
• Nickel Chromium-Molybdenum alloys (NiCrMo)
• Nickel Chromium-Molybdenum-Vanadium alloys (NiCrMoV)

Through-hardening specifications include:

• BS EN 10083-3:2006 & BS EN 10250-3:2000 (UK/EU)
• AISI/SAE alloy series 4xxx, 5xxx, 8xxx & 9xxx (US)

Case-hardening specifications include:

• BS EN 10084:1998 (UK/EU)
• AISI/SAE alloy series 4xxx, 5xxx, 8xxx & 9xxx (US)

Nitriding specifications include:

• BS EN 10085:2001(UK/EU)

Replacement steels can be produced to the old 'EN' numbers.

We can also work to two or more amalgamated specifications, where permitted by the scope of the individual analysis ranges, to meet multiple release requirements.