Plastic mold steel

DIN 1.2083 Plastic Mold Steel | AISI 420 | GB4Cr13

DIN 1.2083 Plastic Mold Steel | AISI 420 | GB4Cr13
DIN 1.2083 Plastic Mold Steel | AISI 420 | GB4Cr13
DIN 1.2083 Plastic Mold Steel | AISI 420 | GB4Cr13
DIN 1.2083 Plastic Mold Steel | AISI 420 | GB4Cr13

Description

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DIN 1.2083 Plastic Mold Steel | AISI420 | GB4Cr13
Ningshing Special-Steel is the leading ditribution and stockist of DIN 1.2083 Plastic Mold Steel. Our large stock of DIN 1.2083 Plastic Mold Steel | AISI420 | GB4Cr13 can meet your demand with immediate delivery. The stock involves different size range of hot rolled /forged rounds and flats, forged blocks. Delivery condiion in Annealed or Q+T.

DIN 1.2083 Plastic Mold Steel is a kind of Martensite stainless steel, with good machincability and excellent corrosion resistance, polishability, and high strength and wear resistance after heat treatment. It is widely used for making plastic moulds and transparent plastic molds which require high load, wear resistance, and work under the action of corroding medium. 

Dimensions
Round: dia.10-500 mm
Hot Rolled Flat: 6-200 x 300-1200 mm
Forged Block: 150-500 x 200-1600 mm
Delivery Condition
EAF+LF+VD+(ESR), Hot Rolled or Forged, Annealed or Q+T, Black surface or Machined surface, UT SEP1921 Class3 D/d

Hardness: 235 HB for Annealed condition, 30-36 HRC for Q+T condition
Equivalence
AISI / SAE DIN / W.Nr JIS GB
420 1.2083 SUS420J2 4Cr13
Chemical Composition(%)
Steel Grade C Si Mn P S Cr
1.2083 0.36-0.42 ≤ 1.00 ≤ 1.00 ≤ 0.030 ≤ 0.030 12.50-14.50
420 ≤ 0.15 ≤ 1.00 ≤ 1.00 ≤ 0.030 ≤ 0.030 12.00-14.00
4Cr13 0.36-0.45 ≤ 0.60 ≤ 0.80 ≤ 0.030 ≤ 0.030 12.00-14.00
Characteristics

It is a kind of Martensite stainless steel with low corrosion, high-alloy, low warpage steel for through hardening with excellent properties for mirror polishing as well as good photoetching, good machinability, high wear resistance and high dimensional stability.

Applications

Used for making Mould plates and inserts for working with chemically aggressive plastics; because of excellent polishing, suitable for optical and medical products

Forging Technique
Heat Temperature Start Forging Temperature Finish Forging Temperature Cooling Method
Slowly heat to 800°C, then
quickly heat to final forging
temperature
1160 - 1200°C >=850°C Ash coolinor sand cooling,
with timely annealing
Heat Treatment

Annealing

840 to 870°C

Slow controlled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air. Hardness after annealing: max. 235 HB.

           

Stress relieving

Approx. 650°C

Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After through heating, hold in neutral atmosphere for 1 - 2 hours.

 

Hardening

1000 to 1050°C / Oil, air

Holding time after temperature equalization: 15 to 30 minutes.

Obtainable hardness: 53-56 HRC

 

Tempering

100 to 200°C (212 to 392°F)

Slow heating to tempering temperature immediately after hardening / time in furnace

1 hour for each 20 mm of work piece thickness but at least 2 hours / cooling in air.

For average hardness figures to be obtained please refer to the tempering chart.

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