20MnCrS5 W.Nr 1.7149 Alloy steel
20MnCrS5 TECHNICAL SPECIFICATION DATASHEET - DIN 20MnCr5
20MnCrS5 MATERIAL CATEGORY: Carburizing structural steel
20MnCrS5 PRODUCT DESCRIPTION
Proven performance in long-term service.
Extensive database of long term, high temperature test results.
High room and elevated temperature strength.Good creep.
High notch tolerance.
Thermal expansion coefficients compatible with low alloy steel turbine casing materials.
Lower design and operating risks
Simplified design for bolting configuration compared with martensitic steels or high nickel alloys.
Alloy structural steel is provided with higher yield strength, tensile strength, endurance strength, yield ratio (about 0.85 generally ) enough plasticity and toughness.
The concentration of alloy element of this kind of steel is quite high, mainly are corrosion resistant steel, heat resistant steel, wear resistant steel, and other special steels of physical and chemical properties. Alloy structural steel has preferable mechanical property than that of carbon structural steel, high performance of heat treatment especially.
The alloy is usually produced by EAF /VD /LF followed by electroslag refining (ESR) if necessary for special purpose.
Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different level according to the buyers' requirements.
Bars are usually supplied bright in the annealed condition, or bright annealing specially.
Final heat treatment - heat treatment / QT
20MnCrS5 MATERIAL SPECIFICATIONS
DIN EN 10084 (1998), DIN 17210 (1986)
20MnCrS5 CHEMICAL COMPOSITION (WEIGHT %)
C (％): 0.17 ~ 0.22
Si (％): ≤ 0.40
Mn (％): 1.10 ~ 1.40
P (％)≤: 0.035
S (％): 0.020 ~ 0.040
Cr (％): 1.00 ~ 1.30
Mo (％): -
Ni (％): -
20MnCrS5 MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Hot working temperature /℃: 1150～850
Heat treatment temperature /℃|annealing: 650～700
Heat treatment temperature /℃|carburizing: 900～950
Heat treatment temperature /℃|quenching (Center): 850～880
Heat treatment temperature /℃|quenching (Surface): 810~840 Oil
Heat treatment temperature /℃|tempering: 170～210
Hardness after annealing HBS≤: 207
Size /mm: φ11
After surface hardening |σb/MPa: 1080~1370
After surface hardening |σs≥/MPa: 735
After surface hardening |δ5(％)≥: 7
After surface hardening |ψ(％)≥: 30
After surface hardening |AKV/J: 34
Size /mm: φ30
After surface hardening |σb/MPa: 980~1270
After surface hardening |σs≥/MPa: 685
After surface hardening |δ5(％)≥: 8
After surface hardening |ψ(％)≥: 35
After surface hardening |AKV/J: 34
Size /mm: φ63
After surface hardening |σb/MPa: 780~1080
After surface hardening |σs≥/MPa: 540
After surface hardening |δ5(％)≥: 10
After surface hardening |ψ(％)≥: 35
After surface hardening |AKV/J: -
20MnCrS5 AVAILABLE SHAPES
Round bar / Flat bar / Square bar / Pipe / Steel strip / Sheet
Bright - peeled + polishing, centerless grinding
Forged - ring, tube, pipe casing, discs, shaft
20MnCrS5 TYPICAL APPLICATIONS
Alloy structural steels are widely used in the filed of ship, vehicle, airplane, guided missile, weapons, railway, bridges, pressure vessel, machine tools, mechanical components with a bigger sectional size and so on.
Power generation – turbine fasteners – boiler support rods
Process plant – fasteners
Mechanical gears, gear shaft, main axis, valve rod
Mechanical parts - connecting rod, bolt and nut
Multidiameter shaft
Pressure vessel, seamless pipe
20MnCrS5 PRODUCT PROFILE
Round bar / Wire rod (Diameter): 5.5mm to 800mm
Square bar / Flat bar: 3mm to 800mm
Length: Fixed length or random length or based on the customer's special requirement.
Heavy/middle plate via hot rolled: T60 - 400mm X W50 - 1200mm X L1000 - 5000mm
Sheet steel via cold rolled: T0.5 - 6mm X W100 - 1000mm X L1000 - 2000mm
Steel strip via cold rolled: T0.1 - 3mm X W5 - 200mm X L (or in coil form)
Forging piece: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
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