5CrNiMo/1.2713 /1.2714/55NiCrMoV6/ 56NiCrMoV7/55NiCrMoV7/SKT4
1.Dia 8mm-1200mm
2. Ultrasonic test according to SEP 1921-84 C/c

5CrNiMo/1.2713 /1.2714/55NiCrMoV6/ 56NiCrMoV7/55NiCrMoV7/SKT4/55NCDV7  

Description

This is one of the special purpose, low alloy tool steel grades, similar to the W group of low alloy tool steels. L6 contains nickel, chromium and molybdenum for a good combination of toughness and hardenability.

Applications

Typically used in machine tool applications such as bearings, springs, rollers or chuck parts, plastic moulds, molds for forging, stamps, die holders and piercers.

RELATED SPECIFICATIONS:       

Germany       W.Nr. 1.2713 /1.2714

        DIN 55NiCrMoV6/ 56NiCrMoV7

Great Britain   EN 55NiCrMoV7

USA          AST T61206(UNS)

              AISI  L6

Italy         UNI 56NiCrMoV7KU

Franch       AFNOR 55NCDV7

Russia       GOST 4ChMNFS

Japan        JIS SKT4  

Chemical Composition (%): 

Carbon       0.50-0.60 

Silicon        0.10-0.40 

Manganese    0.65-0.95

Phosphorus    0.030max 

Sulphur       0.030 max 

Nickel       1.50-1.80

Chromium    0.60-0.80

Molybdenum  0.25-0.35

Vanadium    0.07-0.12

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

SIZE RANGE: 

Round: 

Hot Rolled:  8mm-500mm 

Hot Forged:  80mm-1500mm 

Flat:

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

Hot forged: Thickness:150-600mm Width: up to 1600mm 

SURFACE FINISHES: 

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

Test: Ultrasonic test according to SEP 1921-84 C/c

Soft Annealing
Heat to 670-700oC, cool slowlyin furnace. This will produce a maximum Brinell hardness of 250.

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to approx. 650oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Hardening
Harden from a temperature of 830-870oC followed by oil quenching. Hardness after quenching is 57-61 HRC.

Tempering
Tempering temperature: 400-700oC.

Tempering Temperature (oC) vs. Hardness (HRC)

Forging
Hot forming temperature: 1050-850oC.

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