30CrNiMo8 Modified Steel-Alloy Structure Steel-Heat Treated

• Post Date:

  Jun 07,2013

• Expiry Date:

  Jun 07,2014

• Detailed Description:

  Quantity: 5Metric Tons
  Price:950 USD Metric Tons
  Applications
  30CrNiMo8 Modified Steel is Quench and tempering special CrNiMo steel, equivalent to 30NiCrMo8 standardized according to UNI 7874/7845, characterized by high tensile strength and high toughness. It is suitable to the manufacture of components of maximum thickness equal to 130 mm meanly or strongly stressed and even with a complicated geometry (shafts, camshafts, axles, levers, connecting rods, rocker arms, gear wheels). To improve the workability at the machines tools it can be booked with the addition of Ca or re-sulphurized (S60,1%). The use of re-sulphurized steels involves a worsening of the tensile strength characteristics along the transversal, of the impact strength and of the fatigue strength. Advised austenitic grain dimension > 5 according to UNI 3245 (similar to ASTM E 112-82)
  
  
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  All Grades Comparison
  Material no. DIN17210 BS970
  1.6580 30CrNiMo8 823M30
  AFNOR GB/T 3077 ISO ГOCT 4543
  30CND8 30Cr2Ni2Mo 31CrNiMo8 3KH3M3F
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  Chemical Composition(%)
  C Mn Si P S Cr Ni Mo
  0.26-0.34 0.50-0.80 0.40 max 0.025 max 0.035 max 1.80-2.20 1.80-2.20 0.30-0.50
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  Mechanical Properties(T=20°C if not differently stated)
  Heat treatment state Diameter(mm) Rm (Mpa) Rp0.2 (Mpa) Fracture elongation A5 (%) Notch impact energy ISO-V [J] Hardness (HB)
  SOFT ANNEALED / 844 min / / / 250 max
  ISOTHERMAL ANNEALED / 615-815 / / / 183-242
  QUENCHED AND TEMPERED 16 max 880-1080 685 min 16 min 40 min 289-347
  QUENCHED AND TEMPERED 16-40 930-1080 735 min 16 min 40 min 275-318
  QUENCHED AND TEMPERED 40-100 880-1030 685 min 17 min 40 min 261-303
  QUENCHED AND TEMPERED 100-250 785-935 635 min 18 min 35 min 233-276
  QUENCHED AND TEMPERED 250-500 735-885 590 min 16 min 35 min 218-262
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  HEAT TREATMENT AND HOT PLASTIC DEFORMATION TEMPERATURES
  - TEMPERATURE ° C Cooling Medium
  Hot plastic deformation 850-1100 /
  Normalizing 850-880 air
  Soft Annealing 650-690 air
  Quenching 830-860 oil
  Tempering 540-660 air
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  ADVISED WELDING PROCESSES
  SMAW B (basic); GMAW; GTAW; PAW; LBW*; EBW* ( *on vacuum-sealed outgased steels )
  
  
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  ADVISED WELDING PROCEEDINGS
  1. f.m. at low C + Tp** + TB or PWHT
  2. austenitic f.m. + Tp ( 150 ° C )
  3. f.m. Ni base alloy + Tp ( 150 ° C ) + PWHT
  
  
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  GENERAL PRECAUTIONS
  multipass welding
  
  HD reduction ( 6 5 ); reconditioning of electrodes
  
  edges cleaning
  
  reduction of the degree of the joint constraint
  
  Rd reduction
  
  single layer buttering technique advised
  
  
  
  
  
  Shanghai Unite Steel CO.,LTD
  
  Cindy Liu
  Tel: +86--021--35316960-811
  Fax: +86--021--35316961
  Email:cindyliu@shunitesteel.com
  www.shunitesteel.com
  www.shunitesteel.com.cn

• Company:

  Shanghai Unite Steel Trading Co., Ltd.     [ China ]        

• Contact:

  Cindy Liu

• Tel:

  86-21-35316960-811

• Fax:

  86-21-35316961

• Email:

  cindyliu@shunitesteel.com