40CR alloy structure steel stockholders and suppliers from china. OTAI SPECIAL STEEL Supply in GB 40CR steel round bar, steel plate, sheet, square bar, flat bar, hexagonal Bar, pipe/tube since 2007.our steel stock more 1000tons

GB 40CR alloy Steel is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality low carbon,Low alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered Hardness is 28-34 HRc. GB 40CR steel Annealing delivery hardenss less than 250HB.40CR With a lower carbon content range, So GB 40CR alloy steel have good weldability.

steel bar

Related Specifications ASTM A29/A29M DIN EN 10083/3 JIS G4053 GB/T 3077

Form of Supply

GB 40CR Alloy steel, we can supply the round bar, steel flat bar, plate, hexagonal steel bar and steel square block. GB 40CR steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. 40CR alloy steel Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.

Chemical composition

C(％) 0.37～0.44 Si(％) 0.17～0.37 Mn(％) 0.50～0.80 P(％) ≤0.030
S(％) ≤0.030  Cr(％) 0.80～1.10

Equivalent Of 40Cr alloy Structure Steel

USA Germany China Japan France England Italy Poland ISO Austria Sweden Spain
ASTM/AISI/UNS/SAE DIN,WNr GB JIS AFNOR BS UNI PN ISO ONORM SS UNE
5140 / G51400 41Cr4 / 1.7035 40Cr SCr440 42C4  530A40 / 530M40 41Cr4 2245

Heat treatment Related

  • Annealing of 40CR Alloy structural steel

Slowly heated to 850 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. The 40CR alloy steel will get MAX 250 HB （Brinell hardness）.

  • Hardening of 40CR Alloy structural steel

Heated slowly to 880-920°C, Then after adequate soaking at this temperature quench in oil. Temper as soon as tools reach room temperature.

Mechanical Properties

The mechanical properties of annealed GB 40CR alloy steel are outlined in the table below

Tensile Yield Bulk modulus Shear modulus Poisson’s ratio Izod Impact
KSI KSI KSI KSI ft.lb
76900 55800 20300 11600 0.27-0.30 84.8

Applications

GB 40CR steel is widely used for a variety of applications in the used in the automotive and engineering industries for toolholders and other such components. Typical applications such as valve bodies, pumps and fittings, Shaft, the high load of wheel, bolts, double-headed bolts, gears, etc

Regular size and Tolerance

Steel round bar: Diameter Ø 5mm – 3000mm

Steel plate: Thickness 5mm – 3000mm x Width 100mm – 3500mm

Steel Hexagonal bar: Hex 5mm – 105mm

Others 40CR have not specified size, pls contact our experienced sales team.

Processing

GB 40CR alloy steel round bar and flat sections can be cut to your required sizes. 40CR alloy steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. GB 40CR steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

Contact our experienced sales team to help you with your 40CR alloy steel questionsadn enquiry by Email or Telphone. The questions will be reply in 24 hours.

OTAI SPECIAL STEEL CO., LTD

Email: jack@otaisteel.com   TEL: 0086-769-2319-0193   FAX: 0086-769-88705839