42CrMo4 Alloy Structural Steel manufacturer from China Shandong Anniu Group

Price:	500.0~900.0 USD
Payment Terms:	T/T,L/C
Place of Origin:	Shandong, China (Mainland)


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Product Detail

Means of Transport: Ocean

Packing: standard seaworthy

Production Capacity: 5000 tons monthly

Delivery Date: 25 days

Description:
42CrMo4 materials have been widely used in automotive driving elements. Although 42CrMo4 is more expensive than 41Cr4, it is more prefer

Description:

42CrMo4 materials have been widely used in automotive driving elements. Although 42CrMo4 is more expensive than 41Cr4, it is more preferable in terms of material properties. In this study, these two materials were heat treated by austenitizing in a continuous furnace at 850 °C and quenched in oil at 90 °C. After they were tempered at various temperatures, mechanical properties were determined for each tempering temperature. The material properties for both materials were compared with each other. Results indicated that same mechanical properties for 41Cr4 and 42CrMo4 can be achieved by tempering 41Cr4 about 50 °C lower temperature than for 42CrMo4. In addition to the mechanical tests, fatigue tests were performed for both materials. Weibull distributions were plotted. Results indicated that 42CrMo4 had a longer life than 41Cr4 material.

Chemical Composition

Properties	Metric	Imperial
Hardness, Brinell (typical)	300	33
Hardness, Rockwell C (typical)	30	30
Tensile strength, ultimate	965-1030 MPa	140000-150000 psi
Yield strength,	827-862 MPa	120000-125000 psi
Elongation at break (in 50 mm (2"))	20.0%	20.0%
Compressive strength	862 MPa	125000 psi
Charpy impact (V-Notch)	27.1-33.9 J	20.0-25.0 ft-lb
Poisson's ratio	0.27-0.30	0.27-0.30
Elastic modulus	190-210 GPa	27557-30457 ksi

Hot forming	Narmalaizing+N	Quenching+Q	Quenching+Q		Tempering+T	Stress-relieving+SR
1100-850C	870 C air	860 C oil or polymer	850 C water		540-680 C	50°C under the temperature
Soft annealing+A	Isothermal annealing+i	Spheroidizing annealing+AC	End Quench hardenability test		Pre heating welding	Stress-relieving after welding
720 C air(HP max 241)	820 C fumace cooling to 670 C, then air (HB max 200)	840 C water	300 C		550 C fumace cooling
			Ac1	Ac3	Ms	Mf
			745 C	790 C	335 C	120 C

Mechanical Properties((Hardened and Tempered):

Dia Scope(mm)	Tensile Strength Rm (Mpa)	Yield Strength R2 (Mpa)	Elongation (longitudinal direction) Al (%)	Reduction of area (%)	Impact Energy Joules (-20°C)
16 max	1100-1300	900 min	10 min	40 min	30 min
16-40	1000-1200	750 min	11 min	45 min	35 min
40-100	900-1100	650 min	12 min	50 min	35 min
100-160	800-950	650 min	13 min	50 min	35 min
160-250	750-900	500 min	14 min	55 min	35 min

Heat Treatment:

· Forging: Heat to 1150°C Hold until uniform.Minimum forging temperature 850°C. Cool slowly in ashes or sand etc.

· Annealing: Heat to 830°C – 850°C. Cool in furnace.

· Normalising: Heat to 870°C – 900°C. Cool in still air.

Forging

Heat to 1150 °C Hold until uniform. Minimum forging temperature 850°C. Cool slowly in ashes or sand etc.

ANNEALING

Heat to 830°C – 850°C. Cool in furnace.

Normalizing

Heat to 870°C – 900°C. Cool in still air.

Stress Relieving:

• Annealed: Heat to 600°C – 650°C
• Hardened: Heat to 500°C – 550°C. Cool in still air
• Hardening:Heat to 830°C – 880°C. Quench in oil or polymer.
• Tempering:Heat to 450°C – 700°C cool in still air.
NB. Tempering within the range 200°C–420°C will result in temper brittleness and should be avoided Flame and Induction Hardening: Heat quickly to the required case depth at 860°C – 890°C and quench immediately in water or oil. Tempering at 150°C – 200°C will reduce stresses in the case with minimal effect on its hardness. All de-carburised surface material must first be removed to ensure best results.
• Nitriding: Heat to 500°C – 530°C and hold for sufficient time to develop the depth of case required Parts should be pre-hardened and tempered as required and also premachined leaving a small grinding allowance only.