420F, UNS S42020, X30Cr13, 1.4028, Z33C13


420F, UNS S42020, X30Cr13, 1.4028, Z33C13 martensitic stainless steel corrosion resistant hardening and tempering steel according to AMS 5620, ASTM A582, GE S-400, S-1000, EN 10088-1

420F, UNS S42020, X30Cr13, 1.4028, Z33C13 - Introduction and Application

420F martensitic stainless hardening and tempering steel, containing an average of 13% of chromium, mainly distinguished by the carbon content in the chemical composition and thus the higher endurance properties, it is identical to 420 stainless steel but with an addition of sulfur to dramatically improve the machinability. This alloy has excellent corrosion properties when hardened and offers good ductility in the annealed condition.  This grade is used in similar applications to 420 but where complex geometries require good machining requirements such as dental and surgical equipment, manufacture of shafts, glands, drops, valves, bolts, springs, piston rods, machine parts, molds for pressurized castings, knives and tools used in the food and household industries in the form of rods.


Hot Working

The hot working of 420F, UNS S42020, X30Cr13, 1.4028, Z33C13 martensitic stainless steel is performed by gradually increasing temperature to 760°C (1400°F), then further to 1097-1204°C (2000-2200°F). Later it is cooled slowly in the furnace so as to prevent cracking. Reheating has to be performed often to maintain the working temperature above 871°C (1600°F).


Cold Working

420F, UNS S42020, X30Cr13, 1.4028, Z33C13 martensitic stainless steel can withstand only minor cold working. Radical forming will cause cracking.



Melted process

AOD


420F, UNS S42020, X30Cr13, 1.4028, Z33C13 - Chemical composition WT %

GradeChemical Composition WT %
C:Mn:Si:P:S:Cr:Ni:Mo:Cu:
420F, UNS S420200.20 - 0.40Max 1.00Max 1.50Max 0.040.20-0.4011.50 - 14.0Max 1.00Max 0.50
X30Cr13, 1.40280.26 - 0.35Max 1.5Max 1.0Max 0.04Max 0.0312.0 - 14.0


X29CrS13, 1.40290.25 - 0.32Max 1.5Max 1.0Max 0.040.015 - 0.02512.0 - 13.5-Max 0.6-
Z33C130.28 - 0.38Max 1.0Max 1.0Max 0.040.015 - 0.03012.0 - 14.0---
3H140.26 - 0.35Max 0.8Max 0.8Max 0.04Max 0.03Min 14.0Max 0.6--
420S450.28 - 0.36Max 1.0Max 1.0Max 0.04Max 0.0312.0 - 14.0Max 1.0--
30Ch13, 30Kh13, 30Х130.26 - 0.35Max 0.8Max 0.8Max 0.03Max 0.02512.0 - 14.0Max 0.6-Max 0.3

Mechanical Property of 420F, UNS S42020, X30Cr13, 1.4028, Z33C13

PropertiesMetricImperial
Tensile strength655 MPa95000 psi
Yield strength (@strain 0.200%)380 MPa55100 psi
Elastic modulus190-210 GPa27557– 30458 ksi
Poisson's ratio0.27-0.300.27-0.30
Elongation at break (in 50 mm)22%22%
Hardness, Brinell220220
Hardness, Rockwell C (converted from Brinell hardness, value below normal Rockwell C hardness range, for comparison only)1818

Mechanical properties of 420F, UNS S42020, X30Cr13, 1.4028, Z33C13 in heat-treated state +QT

  • Tensile strength, Rm: 800 - 1000 MPa
  • Yield point, Re: Min 600 MPa
  • Elongation, A: Min 10%
  • HRC Hardness: 45-51
  • HV Hardness: 450 - 550
  • Tharmal capacity, c-1
  • Thermal conductivity coefficient, λ: 30 W * m-1
  • Modulus of elasticity, E: 215 GPa
  • Linear Expansion Factor, α: 10,5 * 10-1

mechanical properties in annealed condition A

  • HB Hardness: Max 235 HB
  • HV Hardness: Max 235 HB
  • HRB Hardness: Max 97 HB
  • Yield point, Re: Max 740 MPa
  • Elongation, A: Min  15%
  • Density: 7,72 g / cm3

Mechanical properties of smooth bars, drawn wires, cold rolled strips

Mechanical properties of products +1C, +1E, +1D, +1X, +1G, +2D in +A condition
  • HBW Hardness: Max 245
  • Tensile strength, Rm: Max 800 MPa
Mechanical properties of smooth bars +2H, +2B, +2G, +2P in +A
  • Dimensions Max 16mm 
    • Tensile strength, Rm: Max 950 MPa
    • HB Hardness: Max 305 HB
  • Dimensions 16-40mm 
    • Tensile strength, Rm: Max 900 MPa
    • HB Hardness: Max 280 HB
  • Dimensions 40-63mm 
    • Tensile strength, Rm: Max 840 MPa
    • HB Hardness: Max 260 HB
  • Dimensions 63-160mm 
    • Tensile strength, Rm: Max 840 MPa
    • HB Hardness: Max 260 HB
Mechanical properties of +2D wires in +A
  • Dimensions 0.5 - 1.0mm 
    • Tensile strength, Rm: Max 1100 MPa
    • Elongation, A: Min 10%
  • Dimensions 1.0 - 3.0mm 
    • Tensile strength, Rm: Max 1050 MPa
    • Elongation, A: Min 10%
  • Dimensions 3.0 - 5.0mm 
    • Tensile strength, Rm: Max 1000 MPa
    • Elongation, A: Min 10%
  • Dimensions Min 5mm 
    • Tensile strength, Rm: Max 950 MPa
    • Elongation, A: Min  15%

Mechanical properties of products +1C, +1E, +1D, +1X, +1G, +2D in +QT850

  • Tensile strength, Rm: 850 - 1000 MPa
  • Yield point, Re: Min 650 MPa
  • Elongation, A: Min 10%
  • Impact resistance, KV20℃: Min 12J

Mechanical properties of smooth bars +2H, +2B, +2G, +2P in +QT850

  • Dimensions Max 10mm 
    • Tensile strength, Rm: 900 - 1050 MPa
    • Yield point, Re: Min 700 MPa
  • Dimensions 10-16mm 
    • Tensile strength, Rm: 900 - 1150 MPa
    • Yield point, Re: Min 650 MPa
  • Dimensions 16-40mm 
    • Tensile strength, Rm: 850 - 1100 MPa
    • Yield point, Re: Min 650 MPa
  • Dimensions 40-63mm 
    • Tensile strength, Rm: 850 - 1050 MPa
    • Yield point, Re: Min 650 MPa
  • Dimensions 63-160mm 
    • Tensile strength, Rm: 850 - 1000 MPa
    • Yield point, Re: Min 650 MPa

Mechanical properties of +2H wires in +QT850 condition with dimensions Min  0.05mm

  • Condition +C500 - Rm: 500 - 700 MPa
  • Condition +C600 - Rm: 600 - 800 MPa
  • Condition +C700 - Rm: 700 - 900 MPa
  • Condition +C800 - Rm: 800 - 1000 MPa
  • Condition +C900 - Rm: 900 - 1100 MPa
  • Condition +C1000 - Rm: 1000 - 1250 MPa
  • Condition +C1100 - Rm: 1100 - 1350 MPa
  • Condition +C1200 - Rm: 1200 - 1450 MPa
  • Condition +C1400 - Rm: 1400 - 1700 MPa
  • Condition +C1600 - Rm: 1600 - 1900 MPa
  • Condition +C1800 - Rm: 1800 - 2100 MPa

Mechanical properties of coldrolled stripes according to EN 10151

  • Condition +C700 - Rm: 700 - 850 MPa
  • Condition +C850 - Rm: 850 - 1000 MPa
  • Condition +A - Rm: 540 - 740 MPa
  • Modulus of elasticity in delivery,E= 210 GPa
  • Modulus of elasticity after cold rolling and heat treatment, E= 220 GPa

Mechanical properties at elevated temperatures

PropertiesTemperatures
100℃200℃300℃400℃
Linear Expansion Factor, α* 10-110.511.011.512.0
Modulus of elasticity, EGPa212205200190

Physical Property of 420F, UNS S42020, X30Cr13, 1.4028, Z33C13

PropertiesMetricImperial
Density7.80 g/cm30.282 lb/in³


Heat Treatment of 420F, UNS S42020, X30Cr13, 1.4028, Z33C13

  • Annealing at 843-900°C (1550-1650°F), followed by slow furnace cooling.
  • Hardening at 950 - 1050℃ with oil or air cooling
  • Tempering at 625 - 675℃
  • Softening annealing at 745 - 825 ℃ with air cooling
  • Rolling and forging at 1100 - 800 ℃

Welding of 420F, UNS S42020, X30Cr13, 1.4028, Z33C13

420F, UNS S42020, X30Cr13, 1.4028, Z33C13 martensitic stainless steel stainless steel is basically not welded as it has air hardening characteristics. However, welding can be performed after preheating to 149-204°C (300-400°F) with post-weld tempering for 2 h. The filler metal used has to be AWS E/ER420.


Machining of 420F, UNS S42020, X30Cr13, 1.4028, Z33C13

420F, UNS S42020, X30Cr13, 1.4028, Z33C13 martensitic stainless steel has good machinability due to the presence of sulfur.


Equivalent grades of 420F, UNS S42020, X30Cr13, 1.4028, Z33C13

420F, UNS S42020, X30Cr13, 1.4028, Z33C13, SUS 420J2, 3CR13, 1.4028, X30CR13, X29CRS13, 1.4029, 30CR13, X33CR13, Z33C13, Z30C13, CSN 17023, 3CH13, 30CR130, 420S45, 420 S 45, 3H14, UNS S42080, 30CH13, 30KH13, 30Х13, AISI 420B