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[China]
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Contact name:Eric
SHANGHAI UNITE STEEL |
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Forged Alloy structural steel SCM415 /18CrMo4/1.7243
1, APPLICATIONS:
usually being used at the quenched and tempered or case hardening state,for the manufacture of non-corrosive media and working temperature below 250 , the medium containing a mixture of nitrogen and hydrogen in the work of a variety of high-pressure pipes and fasteners, the higher the infiltration carbon components, such as gears, shafts and so on.
2, RELATED SPECIFICATIONS:
USA ASTM 4118
Japan JIS SCM420
China 20CrMo
3, Chemical Composition (%):
| Grade | C | Si | Mn | P≤ | S≤ | Cr | Mo | V | Ni |
| 18CrMo4 | 0.15-0.21 | 0.4max | 0.60-0.90 | 0.035 | 0.035 | 0.90-1.20 | 0.15-0.25 | ---- | ----- |
4, Process: EAF+LF+VOD+Forged+Heat Treatment(optional)
5, SIZE RANGE:
Round:
Hot Forged: 80mm-1500mm
6, SURFACE FINISHES:
Black, Peeled(K12), Cold Drawn, Turned & Polished(H10, H11), Precision Ground(H9, H8)
7, Test: Ultrasonic test according to SEP 1921-84
Normalizing
Normalizing temperature: 860-900oC.
Hardening
Harden from a temperature of 850-880oC followed by oil or water
quenching. Hardness after quenching is 39-47 HRC.
Tempering
Tempering temperature: 595-700oC.
Forging
Hot forming temperature: 1100-850oC.
Certificate of Quality: issued in English, in addition the normal terms, production process, the mechanical property yield strength, tensile strength, elongation and hardness, forged ratio, UT test result, Grain size, heat treatment methods and the sample of is shown on the Certificate of Quality.
Marking: Heat No. will be cold stamped and Steel grade, diameter mm, length mm, and the manufacturer LOGO and weight kg is painted.
