420, X20Cr13, 1.4021 martensitic stainless steel

420, X20Cr13, 1.4021 martensitic stainless steel - Introduction and Application

AISI 420, X20Cr13, 1.4021 martensitic stainless steel martensitic stainless steel intended for thermal improvement, showing high mechanical properties - strength, ductility and machinability, while maintaining sufficient corrosion resistance, 420 martensitic stainless steel has higher carbon than the 410 and 416 alloys giving it a higher hardness. 420 has excellent corrosion properties when hardened and offers good ductility in the annealed condition.  This grade is widely used for the production of bolts at elevated temperatures, turbine blades, knives, decoration, surgical instruments, bushings, valve seats, scrapers, blades, ramparts, checks, springs, machine parts, moulds for casting under pressure, and the pins exposed to light loads in the automotive, petrochemical, industrial hydraulics and energy industries.

---

420, X20Cr13, 1.4021 martensitic stainless steel - Chemical composition WT %

---

Mechanical Property of 420, X20Cr13, 1.4021 martensitic stainless steel

• Annealed softened delivery condition +A 
• Tensile strength for peeled bars, Rm: Max 760 MPa
• Hardness for peeled bars, HB: Max 230
• Tensile strength for peeled bars, Rm: Max 910 MPa
• The hardness for drawn bars, HB: Max 290
• Heat-treated condition +QT700 
• Tensile strength, Rm: 700 - 1000 MPa
• The yield point, Rp0,2: Min 500 MPa
• Elongation, A:Min  8%
• Impact resistance, KV: Min  25J
• Tensile strength, Rm: 700 - 850 MPa
• The yield point, Rp0,2: Min 500 MPa
• Elongation, A:Min  13%
• Impact resistance, KV: Min  25J
• Properties for peeled bars 
• Properties for drawn bars 
• Heat-treated condition +QT800 
• Tensile strength, Rm: 800 - 950 MPa
• The yield point, Rp0,2: Min 600 MPa
• Elongation, A:Min  12%
• Impact resistance, KV: Min  20J
• Thermal capacity, c-1
• Modulus of elasticity, E = 215 GPa
• Thermal conductivity, λ = 30 W * m-1
• Specific resistance, Ω: 0.60 mkOhm * m
• Linear expansion coefficient, α: 10.5 * 10-1

Mechanical properties for sheets

• Annealed delivery condition +A 
• Tensile strength, Rm: Max 700 MPa
• Elongation, A:Min  15%
• Hardness, HB/HV: Max 225
• Hardness, HRB: Max 95
• Heat-treated condition +QT650 
• Tensile strength, Rm: 650 - 850 MPa
• The yield point, Rp0,2: Min 450 MPa
• Elongation, A:Min  12%
• Heat-treated condition +QT750 
• Tensile strength, Rm: 750 - 950 MPa
• The yield point, Rp0,2: Min 550 MPa
• Elongation, A:Min  10%
• Hardness in HRC improved condition: 44-50
• Hardness in HV improved condition: 440 - 530

The mechanical properties of cold-rolled strips

• Delivery condition +A - Tensile strength, Rm: 500 - 700 MPa
• Delivery condition +C700 - Tensile strength, Rm: 700 - 850 MPa
• Delivery condition +C800 - Tensile strength, Rm: 850 - 1000 MPa

---

Physical Property of 420, X20Cr13, 1.4021 martensitic stainless steel

---

Heat Treatment of 420, X20Cr13, 1.4021 martensitic stainless steel

• Annealing at a temperature of 745 - 825 ℃ with cooling in air
• +QT650 - Hardening in 950 - 1010℃ with cooling in oil or air, tempering at 700 - 780℃
• +QT700 - Hardening in 950 - 1050℃ with cooling in oil or air, tempering at 650 - 750℃
• +QT750 - Hardening in 950 - 1010℃ with cooling in oil or air, tempering at 620 - 700℃
• +QT800 - Hardening in 950 - 1050℃ with cooling in oil or air, tempering at 600 - 700℃
• Rolling and forging at a temperature of 1100 - 800 ℃

---

Welding of 420, X20Cr13, 1.4021 martensitic stainless steel

AISI 420 stainless steels are welded using welding rods, coated with grade 420 metals, to achieve high-strength joints. During the process, steels are pre-heated at 150 to 320°C and post-heated to 610 to 760°C. In the “as welded” condition, parts are welded using grade 309 filler rods to achieve ductile joints. However, grade 309 electrodes or rods are recommended for welding grade 420 steels by AS 1554.6.

---

Machining of 420, X20Cr13, 1.4021 martensitic stainless steel

AISI 420 steels can be easily machined in their annealed state, but they are difficult to machine having a hardness greater than 30HRC. One of the most readily available machined alternatives is the free-machining grade 416 steels.

---

Equivalent grades of 420, X20Cr13, 1.4021 martensitic stainless steel

AISI 420, UNS S42000, 1.4007, 2H13, X20CR13, X 20 CR 13, 1.4021, AISI 420, Z20C13, Z 20 C 13, ASTM A176 Grade 420, ASTM A276 Grade S42000, ASTM A314 Grade S42000, ASTM A473 Grade 420, ASTM A580 Grade S42000, ASTM A582 Grade S42023, ASTM A895 Grade S42020, ASTM A895 Grade S42023, ASTM A959 Grade S42000, ASTM A959 Grade S42020, ASTM A959 Grade S42023, DIN 1.4021, DIN X20Cr13, DIN X30Cr13, DIN 1.4031, DIN 1.4034, DIN X46Cr13, AFNOR Z20C13, AFNOR Z44C14, BS 420S37, BS 420S29, BS 420S45, UNI X20Cr13, UNI X40Cr14, SS 2303, SS 2304, SAE 420, JIS SUS420J1, JIS SUS 420J1, JIS SUS420J1FB, JIS SUS420J1TKA, EN X20Cr13, EN 1.4021, EN X39Cr13, EN 1.4031, EN X46Cr13, EN 1.4034, ISO 20Cr13, ISO X46Cr13, GOST 20Ch13, GOST 40Ch13, GB 2Cr13, UNS S42000, UNE F.3405, 2H14, 420S29, 420 S 29, 20Х13, 20CH13, 20KH13

---

In the steel grades above we can supply:

• 420, X20Cr13, 1.4021 martensitic stainless steel Steel bar
• 420, X20Cr13, 1.4021 martensitic stainless steel Steel plate and sheet
• 420, X20Cr13, 1.4021 martensitic stainless steel Open die and closed die forgings and forged steel
• 420, X20Cr13, 1.4021 martensitic stainless steel Hot extrusion and cold-rolled welded seamless tubes pipe
• 420, X20Cr13, 1.4021 martensitic stainless steel Hot-rolled and Cold-rolled strip steel
• 420, X20Cr13, 1.4021 martensitic stainless steel Steel wire
• 420, X20Cr13, 1.4021 martensitic stainless steel Special shaped

---