BS970 817M40 PDF

Following forging operation the work piece should be cooled as slowly as possible. And cooling in in sand or dry lime is recommended etc. Tempering alloy steel should be in the heat treated or normalized and heat treated condition before tempering. The tempering temperature for depends upon the strength level desired. Flame or Induction Hardening As mentioned above, pre-hardened and tempered steel bars or plates can be further surface hardened by either the flame or induction hardening methods resulting in a case hardness in excess of Rc

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Following forging operation the work piece should be cooled as slowly as possible. And cooling in in sand or dry lime is recommended etc. Tempering alloy steel should be in the heat treated or normalized and heat treated condition before tempering.

The tempering temperature for depends upon the strength level desired. Flame or Induction Hardening As mentioned above, pre-hardened and tempered steel bars or plates can be further surface hardened by either the flame or induction hardening methods resulting in a case hardness in excess of Rc All de-carburised surface material must first be removed to ensure best results.

Nitriding and tempered alloy steel can also be nitrided, giving a surface hardness of up to Rc Nitriding should be followed by slow cooling no quench reducing the problem of distortion. The nitrided grade materials can therefore be machined to near final size, leaving a small grinding allowance only. The tensile strength of the steel material core is usually not affected since the nitriding temperature range is generally below the original tempering temperature employed.

Surface hardness achievable is to HV. Machinability is best done with the alloy steel in the annealed or normalized and tempered condition. It can be readily machined by all conventional methods such as sawing, turning, drilling etc. Welding of steel in the hardened and tempered condition as normally supplied , is not recommended and should be avoided if at all possible, because of the danger of quench cracking, as the mechanical properties will be altered within the weld heat affected zone.

Some typical applications such as: Aircraft Landing Gear.

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We are currently working with our suppliers to establish alternative mechanisms in order to provide a comprehensive and transparent view of global surcharge variations. Look out for our improved surcharge pages appearing in the coming weeks. Description M40 grade steel is a general purpose steel used for a wide range of engineering parts. It is capable of being heat treated to produce a wide range of tensile strengths combined with good ductility and resistance to shock. It has good hardenability, enabling it to be used for medium tensile strengths in fairly large sections, and possesses good resistance to wear. At low temperatures good impact values can also be obtained.

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