• High Peak Steels Ltd, Brookfield Ind Est, Peakdale Road, Glossop, Derbyshire, SK13 6LQ

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BLACK 817M40T

Description

A commonly used 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 excellent hardenability, enabling it to be used for medium tensile strengths in fairly large sections, and possesses great resistance to wear. At low temperatures good impact values can also be obtained. Bars are often supplied in the hardened and tempered condition with a tensile strength range of 850-1000 N/mm². Material is readily machinable so that the components can be put into service without the cost of further treatment. Bars can also be supplied in the softened state which require hardening and tempering but give increased machinability. Nickel-chromium-molybdenum steels benefit from a combinations of alloying elements. Nickel imparts toughness; chromium depth of hardness; molybdenum inhibits temper brittleness and each elements tends to reduce grain size.”

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Products & Sizes

ProductMin sizeMax size
codes-round240mm dia400mm dia
codes-flat220mm x 10mm900mm x 300mm
codes-square225mm150mm
codes-hex2

Associated Standards

StandardCode
UK StandardEN24
European Grades34CrNiMo6
Werkstoff
1.6565, 1.6582
SAE/AISI4340

Chemical Composition

 CSiMnSPCrNiMo
Min0.360.10.4511.30.2
Max0.440.350.70.040.0351.41.70.35

 

Mechanicals

 Yield
N/mm2
0.2% proof
N/mm2
UTS (Rm)
N/mm2
Elong (A)
%
Red of Area (Z)
%
Hardness
HB
Impact Test (KV)
J
Quenched & Tempered to condition T (min)
6808501324850
Quenched & Tempered to condition T (max)
1000302
Quenched & Tempered to condition U (min)
7559251226942
Quenched & Tempered to condition U (max)
1075331
Quenched & Tempered to condition V (min)85010001229342
Quenched & Tempered to condition V (max)1150352

Typical Applications

  • Automotive parts
  • Gears
  • Induction hardened pins
  • Axle shafts
  • Oil & Gas parts
UA-23101739-40