30CrNiMo8 Modified Steel-Alloy Structure Steel-Heat Treated

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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) Back to Top All Grades Comparison Material no. DIN17210 BS970 1.6580 30CrNiMo8 823M30 AFNOR GB/T 3077 ISO ГOCT 4543 30CND8 30Cr2Ni2Mo 31CrNiMo8 3KH3M3F Back to Top 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 Back to Top 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 Back to Top 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 Back to Top ADVISED WELDING PROCESSES SMAW B (basic); GMAW; GTAW; PAW; LBW*; EBW* ( *on vacuum-sealed outgased steels ) Back to Top 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 Back to Top 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 SKYPE:ustcindy Email:cindyliu@shunitesteel.com www.shunitesteel.com www.shunitesteel.com.cn

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Shanghai Unite Steel Trading Co., Ltd.

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