GB/T Cr12 Cold Worked Tool Steel

GB/T Cr12 Cold Worked Tool Steel

1: GB/T Cr12 steel introduction
    GB/T Cr12 cold work steel, also know as DIN 1.2080 (Werkstoff) and JIS SKD1, is a 12% chrome alloy steel. D3 cold work steelhas very high wear resistance against abrasive and adhesive wear due to the high volume of hard carbides in the steel matrix, medium toughness, dimensionally stable, high compressive strength, not secondary hardenable. Type AISI D3 cold works tool steel is oil-quenched; though small sections can be gas quenched after austenitization using vacuum. As a result, tools made with type D3 cold work tool steel tend to be brittle during hardening. 

2: GB/T Cr12 Steel equivalent

3: GB/T Cr12 steel chemical composition

4: GB/T Cr12 steel mechanical properties
    The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.

5:GB/T Cr12 steel overviews

6: Heat treatment                                                                                                       

Isothermal annealing:

-   Heat to 800°Cand hold at temperature for 1/2 h to 1 h;

-   Furnace cooling to 670°Cand hold at temperature for at least 10 hours;

-   Cool by 10°C/h to 630°C;

-   Cooling in air.

Maximum hardness:≤240 HB

Stress relieving:

    To be carried out after maching before the final heat treatment.

-   Heat to 600-650°C, hold for 4-6 hours;

-   Cooling in furnace to 300-350°C;

-   Cooling in air

Hardening:

-   Initial preheating to 350-450°C;

-   Second preheating to 650-750°C;

-   Heat to hardening temperature 860-890°Cand hold at temperature;

-   Cooling in hot oil (40-60°C); oil quenched hardness: 54-59HRC;

Tempering:

    Tempering must be carried out within one hour from hardening(warm part) in the range 550-630°Cfor 4-6 hours according to hardness required, the dimensions of the parts and operating conditions.

7: Delivery condition
    For hot forged or hot rolled bar, usually the delivery condition is hot forged or rolled, annealed, rough turned.
    For hot forged plate, usually the delivery condition is hot forged, annealed, milled surface.
    For hot rolled plate, usually the delivery condition is hot rolled, annealed, black surface.

Hongxin Mold Tech Co.,Ltd. owns 1 set of Hot Rolling Production Line at size range  flats 8-80*210-710mm, rounds 16-50mm Dia.

12 sets of Hydraulic Forging Hammers from Power 560kgs to 6000kgs which could cover flats 40-300*210-710mm.

8 sets of EF+LF+VD

5 sets of ESR

9 sets of Milling Machines

10 sets of Turning Lathes

6 sets of Precision Milling Machines. 

 CERTIFICATION: GB/T19001-2016/ISO9001:2015

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Packaging&Shipping

Q1:Are you trading company or manufacturer ?
We are the biggest tool steel factory at Daye & Huangshi. We can provide a wide range of steel products.

Q2:What is alloy steel round bar export packing?

Usually bundling for large diameter,small diameter bars in bulk or as customer's demand.

Q3.What is your MOQ?

We accept small order,if it is stock,any quantities can be accepted.

Q4.What is your lead time?

Depends actual order,around 20-35 days,or negotiation.

Q5.Can you supply sample?

Yes,we can.Sample fee according to your size.

 Q6:What certificates do you have?

ISO, ABS, BV, CCS, Dnv, Lr, Gl, Mill Certificate

Q7: How can I get your quotation as soon as possible?
The email and fax will be checked within 24 hours,meanwhile,the Skype,Wechat and WhatsApp will be online in 24 hours.Please send us your requirement,we will work out a best price soon.