ASTM 4118 Round Bar 1.7243 /18crmo4 Alloy Special Steel

• Customization: Available
• Type: Round
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Model NO.: Round bar
• Technique: Forged
• Shape: Plate
• Surface Treatment: Black or as Required
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
• Application: Tool Steel Bar
• Surface Condition: Bright/Black/Grind
• Applications: Mold
• Process: Eaf+Laf+Vd+ESR+Efs
• Transport Package: Wooden
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7228400000
• Production Capacity: 5000 Ton/Year

Product Description

About Product

ASTM 4118 Steel is a low carbon case hardening steel which has at least 0.9Cr%,0.15%Mo as strengthening
elements as per EN10084 standard.It has good process performance ,and has high strength when
temperature at 500-550 °C.The oxidation resistance is deteriorated and the creep strength is remarkably
lowered when temperature exceeds 550°C.The weldability of 18CrMo4 steel is also very good, with
excellent machining or cutting properties.

Chemical Composition(%)

C	Si	Mn	P	S	Cr	Mo
0.15 - 0.21	max   0.4	0.6 - 0.9	max   0.025	max   0.035	0.9 - 1.2	0.15 - 0.25

ASTM 4118 Steel is one of popular alloy steel used as engineering steel. Otai steel is one of leading supplier of ASTM 4118 steel materials in reliable quality.

ASTM 4118 Steel one steel grade in ASTM A29 standard. ASTM 4118 steel is one of popular alloy steel used for engineering purpose, like fasteners, high pressure pipe and more advanced carburized parts, such as gear, shaft, etc. which work in the noncorrosive medium and temperature below 250 ºC, working with nitrogen hydrogen mixture in the medium.

Physical properties

• Modulus of elasticity [103 x N/mm2]: 210
• Density [g/cm3]: 7.85
• Thermal conductivity [W/m.K]: 20.0

Forging of ASTM Grade 4118 Steel
Hot forming temperature: 1100-850oC.
Heat Treatment

• Normalizing

Normalizing temperature: 860-900oC.

• Hardening

Harden AISI 4118 steel from a temperature of 850-880oC followed by oil or water quenching. Hardness after quenching is 39-47 HRC.

• Tempering of 4118 steel

Tempering temperature: 595-700oC.

Application of AISI 4118 Alloy Steel
ASTM 4118 case hardening alloy steels are widely used as gear components of all kind and cog wheels. Open die steel forgings for general engineering purposes. Otai steel are available to supply different size of AISI 4118 steel and is able to supply modified 4118/SCM420/18CrMo4 steel composition according to different requirements.