20CrMo hot rolled steel sheet

steel round bars are widely used in machinery making, autombile making, railway, mine machinery, petoleum machinry, agricultural machinery and civil archtectue such as all kinds of shafts, screws, connecting rods, hardware tools, gears, standard parts, spanners fasteners, structural parts for automobile and agricultural machinery, outer and iner sleeves, rollers and balls for bearing making.
GB 20CrMo steel is a kind of Chinese alloy steel for engineering and mechanical structure purpose, which is generally used in quenching or tempering or carburizing and quenching. 20CrMo material has high heat strength, good hardenability, no temper brittleness, cold strain plasticity, good machinability and weldability.

20crmo Alloy Steel Bar Chemical Composition

Grade	C	Si	Mn	P	S	Cr	Mo
20CrMo	0.17-0.24	0.17-0.37	0.40-0.70	≤0.030	≤0.030	0.80-1.10	0.15-0.25

Mechanical Property:

Tensile strength σb (MPa)	Yield Strength σs 0.2 (MPa)	Elongation δ 5 (%)	Reduction of crosssection area  ψ (%)	Ballistic work Akv (J)	Pounding toughness value  αkv (J/cm2)	Hardness (HB)	Specimen Size
Min 835	Min 540	Min 10	Min 40	Min 47	Min 59	Max 179	15mm

  Applications

20CrMo alloy steel is used in the manufacture of non-corrosive media in chemical equipment and high pressure pipes, fasteners, steam turbines, boiler blades and forgings with working temperature below 250 °C, and important carburizing parts such as gears and shafts in general machines. It can also be used in place of 1Cr13 steel to manufacture medium pressure, low pressure steam turbines in the superheated steam zone pressure stage working blades.
 

Heat Treatment Specification

• First quenching heating temperature: 880 °C (Quenching agent: water, oil)
• Tempering heating temperature: 500 °C (agent – water, oil)

Equivalent Grades

20CrMo material equivalent to US ASTM, European Germany DIN EN, British BS EN, France NF EN, Japanese JIS, and ISO standard. (For reference)

20CrMo steel equivalent

China

USA

Germany

Japan

France

UK

ISO

Standard

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Standard

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Grade (Steel Number)

Standard

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Grade (Steel Number)

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Grade (Steel Number)

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GB/T 3077

20CrMo

AISI SAE; ASTM A29/A29M

4120

DIN EN 10083-3

25CrMo4 (1.7218)

JIS G4053

SCM420

NF EN 10083-3, NF A35-551

25CrMo4 (1.7218), 18CD4

BS EN 10083-3, BS 970 Part 1

25CrMo4 (1.7218), 708M20

ISO 683-1

18CrMo4