2.Equivalent Grades

SKD10/ D2/ 1.2379   
other cold work mould steel grade: D3,1.2080, Cr12MoV, Cr12, Cr12Mo1V1.

3.Form&Size

1)1.2379 Tool Steel round bars, flat/square bars,plates,sheets.

2)DIN 1.2379 Tool Steel Size Available(Length can be customized)

4.Round bar

Diameter (mm) Length (mm)

Round bar: 12~50 x 2000~5800       Hot rolled
                      50~500 2000~5800          Forged

5.Flat bar

Thickness(mm) Width(mm) Length (mm)
Flat bars/blocks: 20~600 x 50~1000 x 1000~5800

6.Surface Condition

1)Black,Peeled,Turned,Grinded;

2)D2 die steel should be free of heavy scale,deep pitting,laps,porosity,injurious segregations,excessive nonmetallic inclusions,seams,cracks,slivers,scale marks,dents,soft and hard spots,pipes or any defects that would detrimentally affect the suitability of 1.2379 mold steel.

3)Visual examination for D2 mould steel shall be made to ensure compliance with the requirements for workmanship,finish,dimensions and tolerances,identification marking and packaging.

7.Straightness

  The permissible deviation of 1.2379 tool steel shall not exceed 3mm in 1000mm length.This applies also to bars under 1000mm in length.Measurement is taken on the concave side of D2 steel with a straight edge.

8.Hardness

   AISI 1.2379  tool steel annealed hardness values when obtained in accordance with the latest issue of test methods and definitions A370 shall not exceed 255 Brinell.

9.HeatTreatment

Annealing
1)Heat D2 steel slowly and uniformly to 900°C.
2)Soak for three to four hours and cool in the furnace to room temperature.
3)Re-heat 1.2379 steel to 900-1040°C and again soak for three to four hours.
4)Cool the material in the furnace to room temperature. 

Hardening
Pre heat 1.2379 die steel component to the temperature 750°C.The material can be brought up to 1000°C for air cooling, or 970°C for oil quenching. Soak thoroughly at the temperature for thirty minutes per 25mm,then cool or quench. when heating for hardening,it should not exceed 1020°C.

 Tempering
AISI D2 steel should be done with the least possible delay after hardening.Select a suitable tempering temperature, heat slowly and uniformly.When d2 steel has reached the desired temperature, soak for at least one hour per 25mm of whole dia.Double tempering is recommended.The second tempering should be a repetition of the first. 

10. Other Tool Steel and Mould Steel grade 

 D3/1.2080/X120Cr12, D2/1.2379, SKD11, H13/1.2344, H11/1.2343/4X5MΦC, H21/1.2581, Cr12MoV/ X12MΦ, O1, O2, A2, P20, 1.2714, M2, M3, T1, 4Cr13/40X13, 2Cr13, 9Cr18, DC53, NAK80 etc.