Delivery Time:3-5 days
Certification:CE,FCC,MSDS

AISI 420 Stainless Steel Round Bar , Plastic Mould Steel with Excellent Polishability

Steel Grade:	420	Application:	Plastic Mold Steel
Shape:	Round bar	Standard:	AISI, DIN, JIS, GB
Dimension:	Φ 10 – 500 mm	Surface:	Black, Peeled, Turned, Grinded
Technique:	Hot rolled, Forged	Ultrasonic Test:	100% UT Passed

Description:

◆ Equivalence

AISI / SAE	DIN / W.Nr	JIS	GB
420	1.2083	SUS420J2	4Cr13

◆ Chemical Composition (%)

C	Si	Mn	P	S	Cr
0.16 0.25	≤ 1.00	≤ 1.00	≤ 0.030	≤ 0.030	12.00 14.00

◆ Dimensions

	Hot Rolled	Forged
Diameter (mm)	10-130	60-500
Length (mm)	2000-5800	2000-5800

◆ Delivery Condition

EAF+LF+VD+(ESR), Hot Rolled or Forged, Black surface or Machined surface (Peeled,

Turned, Grinded), UT 100% Passed

We offer two conditions of steel grade of AISI 420

Annealed: Hardness≤235HB

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

◆ Characteristics

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

◆ Applications

1. Components as axle, valve, gear, medical appliance, spring etc., which require high    

    hardness and wear resistance.

2. For making plastic moulds 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

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. 229 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.