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Home > Standard > 1.4021, DIN X20Cr13, AISI 420 standard

1.4021, DIN X20Cr13, AISI 420

1.4021, DIN X20Cr13, AISI 420 standard Download, We provide the main countries around the ISO standard download, including: AISI(US),UNS(US),SAE(US),ASTM(US),AMS(US),ASME(US),MIL(US),FED(US),DIN(DEU),JIS(JPN),AFNOR(FR),B.S.(UK),SS(SWE),UNI(ITA).

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Round bar standard Download
Square-shape steel standard Download
Plate steel standard Download
Billet standard Download
Flat bar standard Download
wire standard Download
tube standard Download
pipe standard Download
Forging standard Download
casting standard Download
sheet standard Download
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Bar stock standard Download
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1.4021, DIN X20Cr13, AISI 420

Designation by Standards

 

Brand Name LH  No. Mat. No. DIN EN AISI
PK3 905 1.4021 X20Cr13 X20Cr13 420

Chemical Composition (in weight %)

 

C Si Mn Cr Mo Ni V W Others
0.20 max. 1.0 max. 1.50 13.0 - - - - -

Description
This alloy is a general purpose heat treatable chromium steel which is a popular cutlery grade. Martensitic stainless steel.

Applications
Dental and surgical instruments, cutlery, pump shafts, plastic molds and dies, steel balls, and various hand tools, pump components, shafts, turbine blades, pressing dies for tablets, glass and plastics processing tools.

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 216
Density [g/cm3]: 7.73
Thermal conductivity [W/m.K]: 30.0
Electric resistivity [Ohm mm2/m]: 0.60
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10-6 oC-1

 

20-100oC 20-200oC 20-300oC 20-400oC 20-500oC
10.5 11.0 11.5 12.0 12.0

Modulus of Elasticity [103 N/mm2]

 

20oC 200oC 400oC
216 205 190


Soft Annealing
Heat to 730-810oC, air cooling. Structure is ferrite with spherical carbides.

Hardening
Harden from a temperature of 950-1050oC followed by oil, air quenching.

Tempering
Tempering temperature: 650-750oC. Transformation structure with ferrite.

Mechanical Properties at Room Temperature

 

Size range mm Heat treatment condition 0.2 % proof stress (N/mm2) Tensile strength (N/mm2) Elongation (%) Notch impact energy (ISO-V) (J) Hardness HB max.
d<=160 Q+T 700 500 700-850 13 25 230
d<=160 Q+T 800 600 800-950 12 20 230

0.2 % Proof Stress (N/mm2) at Elevated Temperatures

 

Condition 100oC 150oC 200oC 250oC 300oC 350oC 400oC
Q+T 700 460 445 430 415 395 365 330
Q+T 800 515 495 475 460 440 405 355

Forging
Hot forming temperature: 1100-850oC.

Machinability
Similar to machining some of the high carbon steel/" target="_blank" class="keylink">tool steel, this alloy has tough, stringy chip build-up.

Embittlemnt: It must be in mind that the temperature range between 425 and 525oC must be avoided owing to embritllement at 475oC.

Corrosion Resistance
420 is resistant to the atmosphere, fresh water, dilute acids and alkalis and fruit and vegetable juices.

Welding
Not commonly welded due to its air hardening characteristics. Welding may be performed after preheating to 149-204oC with post weld tempering at temperature for 2 hours. Filler metal should be AWS E/ER420.

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