826M40/EN 26

Description:

EN26 is a 2.5% nickel - chromium - molybdenum high hardenability, high tensile steel, generally supplied hardened and tempered in the tensile range 1000 - 1150 Mpa (Condition V) Rc 31 - 38.
Characterised by high strength and toughness in very large sections - similar to EN25 but with higher carbon content, particularly suitable where high surface pressure exists.
Pre hardened and tempered EN26 can be further surface hardened by flame or induction hardening, and by nitriding.

APPLICATIONS:

The steel is suited to applications where high surface pressures exist and friction is to be resisted as in the case of severely loaded gears, axles and pinions.

It is used extensively in most industry sectors for applications requiring higher tensile strength and yield strength than 4140, 4340 or En25 can provide.

RELATED SPECIFICATIONS:

Australia       AS 14442007 X9940

Germany       W.Nr 1.6745 40NiCrMo10 4

Great Britain    BS970: Part 3: 1991 826M40

               BS970: 1955 EN26

Chemical composition%:

Carbon    0.36-0.44

Silicon    0.10-0.40

Manganese      0.45-0.70

Nickel     2.30-2.80

Chromium      0.50-0.80

Molybdenum  0.45-0.66

Phosphorous   0.04 max

Sulphur   0.04 max

COLOUR CODE: BLACK AND JADE END

Process:  EAF+LF+VOD+ Forged or Rolled +Heat Treatment(optional)

SIZE RANGE:

Round:

Hot Rolled:  8mm-500mm

Flat:

Hot rolled: Thickness: 20-130mm  Width: less than 610mm

SURFACE FINISHES:

Black, Peeled K12, Cold Drawn, Turned & Polished H10, H11, Precision Ground H9, H8

Ultrasonic test: According to SEP 1921-84 3Cc

Forging:
Heat to 1150 to 1200°C and hold at temperature until throughly soaked and suitable to forge. Do not forge below 850°C.

Heat Treatment:
To harden EN26 first heat the component to 820 to 850°C and hold at temperature until throughly soaked. Quench the EN26 component in oil, water or polymer as required. EN26 can be flame or induction hardened to achieve a high surface hardness.
Tempering
To temper EN26 heat the component to the required tempering temperature (450 to 660°C), thoroughly soak for 1 hour per 25mm thickness of section, cool in air.
Nitriding
EN26 can be nitrided to give a surface hardness of up to 60HRc. Heat to 500 to 530°C and hold for sufficient time to develop the case depth required, no quenching is required.
Stress Relieving
To stress relieve EN26 heat the component to 640 to 660°C and hold until temperature is uniform through the section. Soak the EN26 component for 1 hour per 25mm thickness of section and cool in air.

Certificate of Quality: issued in English, in addition the normal terms, production process, the mechanical property yield strength, tensile strength, elongation and hardness, forged ratio, UT test result, Grain size, heat treatment methods and the sample of is shown on the Certificate of Quality.

Marking: Heat No. will be cold stamped and Steel grade, diameter mm, length mm, and  the manufacturer LOGO and weight kg is painted

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