AISI 4118 Scm420 18crmo4 DIN 1.7243 18CD4 708m20 Tool Steel Bar

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Forged
• Application: Structural Steel Bar, Tool Steel Bar
• Surface Treatment: Polished
• Alloy: Alloy
• Model NO.: KM-801
• Special Use: Mold Steel, Cold Heading Steel
• Size: 130mm-1000mm (Optional)
• Length: 2m,3m,5.8m, 6m, 8m or as Required.
• Delivery Time: 7-30 Days
• Loading Port: Shanghai
• MOQ: 3 Tons
• Certificate: ISO, BV, SGS, Mill Test Certificate
• Packaging Detail: Standard Sea-Worthy Package
• Surface: Bright, Black
• Price Term: Ex-Work, Fob, CFR, CIF, etc.
• Specifications: Flat Bar, Round Bar, Angle Bar, Square Bar
• Transport Package: Standard Sea-Worthy Package
• Specification: 130mm-1000mm (optional)
• Trademark: Kingmetal
• Origin: China (Mainland)
• Production Capacity: 800tons/Month

Product Description

AISI 4118 Scm420 18crmo4  DIN 1.7243 18CD4 708M20 tool steel bar

1.Supply Form & Size & Tolerance

Hot rolled bar:Φ6-Φ130mm,Length:3000-10000mm

Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm

Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm

Surface Finish	Black-Forged	Black-Rolled	Turned	Grinding	Polished	Peeled	Cold Drawn
Tolerance	(0,+5mm)	(0,+1mm)	(0,+3mm)	Best h9	Best h11	Best H11	Best H11

2.Chemical Composition

Grade	C	Si	Mn	Cr	Mo	P	S
18CrMo4/1.7243	0.15-0.21	≤ 0.4	0.6-0.9	0.9-1.2	0.15-0.25	≤ 0.025	≤ 0.035
18CrMoS4/1.7244	0.15-0.21	≤ 0.4	0.6-0.9	0.9-1.2	0.15-0.25	≤ 0.025	0.02-0.04

3.Relevant Standards

USA	UK	Japan	France
4118	708M20	SCM420	18CD4

4. Mechanical Property

Diameter d mm	≤ 16	16-40	40-100
Yield Strength Mpa	≥835	≥685	≥590
Tensile Strength Mpa	1080-1370	930-1300	800-1150
Elongation, %	≥9	≥9	≥10
Reduction of area ,%	≥35	≥35	≥40
impact,J	≥25	≥31	≥31

5.Forging

18CrMo4 forging temperature:950 - 1100°C,cooled as slowly as possible in the air or in sand after forged.

6.Heat Treatment

• Normalizing:  870 - 900°C,Cooling in air
• Soft Annealing:680 - 700°C,Cooling in furnace
• Carburizing:880-980°C
• Core-hardening:860-900°C,oil-polymer salt bath
• Case-hardening:780-820°C,oil-polymer salt bath
• Carbonitriding:860-950°C
• Tempering:150-200°C

7.Surface Hardness

• Soft annealed(+A):Max 207HB
• Treated to hardness range(+TH):156-207HB
• Treated to ferrite-pearlite structure and hardness range(+FP):140-187HB

Type	Distance mm	1.5	3	5	7	9	11	13	15	20	25	30	35	40
+H	HRC Min	39	37	34	30	27	24	22	21	-	-	-	-	-
	HRC Max	47	46	45	42	39	37	35	34	31	29	28	27	26
+HH	HRC Min	42	40	38	34	31	28	26	25	22	20	-	-	-
	HRC Max	47	46	45	42	39	37	35	34	31	29	28	27	26
+HL	HRC Min	39	37	34	30	27	24	22	21	-	-	-	-	-
	HRC Max	44	43	41	38	35	33	31	30	27	25	24	23	22

8.Application

18CrMo4 case hardening steel is widely in gear components of all kind and cog wheels. Open die steel forgings for general engineering purposes.High and medium pressure steam pipes, headers and superheaters.