GB 4Cr13 for making plastic mold and hot runner
Equivalence
| AlSl / 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 | ≤ | ≤ | ≤ | ≤ | 12.50 | |||||||
| 0.42 | 1.00 | 1.00 | 0.030 | 0.030 | 14.50 | ||||||||
| 420 | ≤ | ≤ | ≤ | ≤ | ≤ | 12.00 | |||||||
| 0.15 | 1.00 | 1.00 | 0.030 | 0.030 | 14.00 | ||||||||
| 4Cr13 | 0.36 | ≤ | ≤ | ≤ | ≤ | 12.00 | |||||||
| 0.45 | 0.60 | 0.80 | 0.030 | 0.030 | 14.00 |
Dimensions
| Shape | Thick / Dia.(mm) | Width(mm) | ||||||
| Flat | 6-200 | 20-910 | ||||||
| Plate | 6-120 | 1000-2300 | ||||||
| Block | 150-600 | 200-1500 |
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 33-38HRC or as customized
Characteristics
Martensite
stainless steel, with good machincability and excellent corrosion
resistance, polishability, and high strength and wear resistance after
heat treatment.
Application
It
is also widely used 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 Treatment
| Heat Temperature | Start Forging Temperature | Finish Forging Temperature | Cooling Method |
| Slowly heat to 800ºC,then quickly heat to final forging temperature | 1160-1200ºC | >=850ºC | Ash coolinor sand cooling,with timely annealing |
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.
What we can offer?
We
offer a wide range of steel products in a wide variety of dimensions
and executions, acc.to the common international specifications or
customerized.
Machining and heat treatment are available.
Also, we advise you in choosing the right materials.
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