AS1442 AS1448
A.I.S.I. SAE

BS 970 1955

Typical analysis

Similar Specifications, Other Equivalents Or Names

Typical Uses

K1022

EN3A

.22%C .8%Mn

Bohler WH;Mild Steel; AS1204-350; ASTM A350 LF1 Lloyds 28-32, J9, K class; ASTM A 181; ASTM A350 LF2; ABS Gr 11 AS1448-K1; ASTM A105;   
BS 1503 161-28 - Pneuloca

Constructional grade, used in pipe and pressure vessel fittings, ship shafting and couplings and general engineering applications with low stresses. Weldable

K1040

EN8

.4%C .8%Mn

T Class; AS1448-K5
J3 - Durax

Machinery steel with 35-45 TSI. UTS. Suitable for shafts, crankshafts, gears requiring heat treatment and/or flame or induction hardening

K1045

.45%C .8%Mn

Bohler H; J12
M Class: AS1488-K6 -Duraflex

Similar applications to K1040, Shallow hardening steel. Can be welded if correct procedures are used

K1055

EN9

.55%C .8%Mn

C Class Tyre;
J2 - Superflex

Used for shafts and gears where moderate wear resistance is required and where toughness is not essential. Suitable for track tyres when heat treated.

AS1442
AS1448
A.I.S.I.
SAE

BS 970
1955

Typical Analysis

Similar Specifications, Other Equilvalents Or Names

Typical Uses

4140

EN19

.4%C 1%Cr
.2%Mo

Assab 709; DIN 42Cr Mo4;
Chromol Bohler VCL 140;
E & G SD19; O5

Very suitable for highly stressed gears, shafts, requiring a combination of hardness and toughness, suitable for surface flame or induction hardening.

4340

EN24

.4%C .8%Cr
1.7%Ni .2%Mo

Bohler NMH; R16;
VAGS
Assab 705

A steel with a good hardenability which can be heat treated to a wide range of tensile strengths combined with toughness. Suitable for highly stressed gears, shafts, bolts and machine parts.

8620

EN362

.2%C .5%Cr
.6%Ni .2%Mo

CH362
R23

Low alloy, low hardenability case hardening steel for lightly stressed components. Offers a tougher core than a plain carbon steel. Can be used as a heat treatable steel and offers reasonable weldability.

EN25

.3%C .6%Cr
2.6%Ni .6%Mo

E & G SD50; DIN 34Cr
NiMo6; Vibrac 30; Bohler
VCN 150; R4

A high strength alloy steel with high hardenability, toughness and fatigue resistance. Can be surface hardened and has good machinability in the annealed condition. Used for gears, shafts, axles of large section.

EN 26

.4%C .6%Cr
2.6%Ni .6%Mo

Vibrac 45
R5

Similar to EN25 but offers higher hardness, and wear resistance in severely loaded applications.

SAE or
A.I.S.I.,
DIN

BS 970
1955

Typical Analysis

Similar Specifications, Other Equivalents Or Names

Typical Uses

X3312H

EN36A

.1%C 3.5%Ni
.8%Cr

E & G SD51; DIN 14Ni Cr14
Bohler ES Special; Q5;
CHCN55

Suitable for highly stressed gears and shafts. Also used for die rings and moulding rings.

X9315H

EN39B

.15%C 4%Ni
1.2%Cr
.25%Mo

DIN 14Ni Cr18; Super CHCN
Bohler PPA; R10

Used in components where a very high core strength and shock resistance is essential in large sections. Applications include heavy duty gears, worm gears and plastic moulds.

17CrNi
Mo6

.15%C 1.6%Cr
1.5%Ni .3%Mo

Heavy duty gears, bearings, sleeves, Kingpins, bushes, arbors, pinions, piston pins, ratchets, splined shafts, transmission shafts, plastic moulds, etc..

SAE or
A.I.S.I.,
DIN

BS 970
1955

Typical Analysis

Similar Specifications, Other Equivalents Or Names

Typical Uses

EN40B

.25%C 3%Cr
.6%Mo

Hykro

Offers a medium strength core combined with good ductility and shock resistance. Nitriding produces a very hard wear resistant surface

EN41A

.3%C 1.5%Cr
.2%Mo 1%Al

DIN 27Cr Al 16; Nitralloy; Gr5
bohler ACE; S3

This steel has a lower hardenability and ductility than EN40B but offers an extremely hard wear resistant surface. Can be used for gears, crankshafts, cylinder liners and moulds