AISI 420/DIN 1.2083 Forged Blocks

DIN 1.2083/AISI 420 Forged Blocks are widely used for making plastic molds and transparent plastic molds which require high load, wear resistance, and work under the action of corroding medium.


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AISI 420/DIN 1.2083 Forged Blocks

Product Description

DIN 1.2083 / AISI 420 Steel Forged Blocks for Plastic Mold Making

Equivalence

AISI/SAE	DIN / W.Nr	JIS	GB
420	1.2083	SUS 420J2	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

Dimensions

Thickness (mm)	Width (mm)	Length (mm)
150-600	200-1500	2000-5800

Delivery Condition

EAF+LF+VD+(ESR), Forged, Unmachined or Machined surface, UT 100% Passed

We offer two conditions as

Annealed: Hardness ≤ 235HB

Q+T: Hardness 33-38 HRC or as customized

Characteristics

Martensite stainless steel, with good machinability and excellent corrosion resistance, polishability, and high strength and wear resistance after heat treatment.

Application

It is widely used for making plastic molds and transparent plastic molds which require high load, wear resistance, and work under the action of corroding medium.

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

1. Annealing

840 to 870°C

Slow controlled cooling in the furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air.Hardness after annealing: max. 229 HB.

2. Stress relieving

Approx. 650°C

Slow cooling in the 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.

3. Hardening

1000 to 1050°C / Oil, air

Holding time after temperature equalization: 15 to 30 minutes.

Obtainable hardness: 53-56 HRC

4. 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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