S136/ DIN 1.2083

Description: 1.2083 is a chromium alloyed stainless plastic mould steel, which is characterised by good polishability, good hardenability giving high hardness, with fair corrosion resistance.

Application: applied in all plastic mould, especially used in transparent plastic mould for CD disk, optical equipment mould and those with low acid environment.

Steel Grade:

GB  4Cr13, %

DIN- 1.2083 %

Similar grade: AISI-420,S136/136H, M310,FT64.

Delivery Condition:

Size available:

Square/Round Bar: 12~ 450mm

Flat: thickness,20~ 350mm , width, 500mm - 800mm ,

Length: Contracted.

Forging:
Heat slowly and uniformly to 1000°C. After forging cool slowly.  

Annealing:
Heat slowly to 780°C. Slowly cool in furnace.
Hardening:
Pre heat to 600-700°C until heated through. (Austenitizing temperature 1025°C.) Continue heating to the final hardening temperature of 980-1050°C and allow the component to be heated through.  Protect against decarburisation by using neutral salt bath, controlled atmosphere furnace or vacuum. Air cool or quench in oil.
Tempering:
Heat uniformly and thoroughly at the selected tempering temperatures and hold at heat for one hour per inch of total thickness. Double tempering is recommended.
Nitriding:
Nitriding of 1.2083 gives it a hard surface which is very resistant to wear and corrosion. Howe ver , the nitrided surface reduces the corrosion resistance. Surface hardness after nitriding at 525°C in ammonia gas will be approximately 1000HV.

Welding:
Due to the high risk of crack formation welding of 1.2083 stainless steel should be avoided, if possible. When, howe ver welding is essential, the following serves as a guide:
A.  Welding of soft annealed 1.2083 stainless steel.
·       Preheat to 300 - 500°C
·       Weld at 300-500°C
·       Immediately stress relieve
B.  Repair welding of 1.2083 stainless steel in hardened and tempered condition.
·       Preheat to the tempering temperature (min. 200°C) previously used.
·       Start welding  at tempering temperature
·       Re heat immediately to tempering temperature, but max. 300°C. Soaking time 3 hours.
·       Cool in air to approximately 80°C.
·       Re heat immediately to tempering temperature, but max. 300°C. Soaking time 3 hours.

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