China Forged Steel Round Bar (ASTM 4140, GB 42CrMo, DIN 42CrMo4)

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Forged
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Alloy: Alloy
• Special Use: Alloy Steel
• Model NO.: 4140 STEEL
• Delivery Condition: Forged / Forged+Rough Turned
• Heat Treatment: Annealed, Normalized, Qt
• MOQ: One Piece
• Grades: SAE 4140 En19 42CrMo4
• Transport Package: Standard Sea Worthy
• Specification: 200-1000mm
• Origin: China
• Production Capacity: 3000tons/Month

Product Description

China Forged Steel Round Bar (ASTM 4140, GB 42CrMo, DIN 42CrMo4)

Hammer Forged Steel Round Square Bar  Scm440 Forged Black Steel

1. 4140 forged steel bar sizes we can offer;
Round bar: 200-1000mm
Square bar:150×150-600×600mm

2.Supply condition for  4140 Forged steel bars:Black /Rough Machined /Rough turned

3.Futhur heat treatment for  4140 forged steel :
Normalized
Annealed
Q&T(Quenched&Tempered)

4. 4140 Forged Steel round bar tolerance:
Black surface
Forged sizes up to 500mm (-0/+5mm)
Forged sizes above 500mm in diameter (-0/+8mm)
Machined surface to all sizes (-0/+3mm)

5. 4140 Steel Equivalent

Standard	AISI / SAE 4140
UNS	-
WERKSTOFF NR.	41CrMo4, 42CrMo4, 42CrMoS4, 43CrMo4
BS 970	708M40, 708A42, 709M40, En19, En19C
UNI	41CrMo4, 38CrMo4 (KB), G40 CrMo4, 42CrMo4
JIS	SCM 440, SCM 440H, SNB 7, SCM 4M, SCM 4
EN name	42CrMo4
EN #	1.7223, 1.7225, 1.7227, 1.3563

6. Scm440 Forged steel chemical composition

Standard	Grade	C	Si	Mn	P	S	Cr	Mo
ASTM A29	4140	0.38-0.43	0.15-0.35	0.75-1.00	≤ 0.035	≤ 0.04	0.8-1.1	0.15-0.25
	42CrMo4	0.38-0.45	≤ 0.4	0.6-0.90	≤ 0.025	≤ 0.035	0.9-1.2	0.15-0.30
EN10083	1.7225
JIS G4105	SCM440	0.38-0.43	0.15-0.35	0.6-0.85	≤ 0.035	≤ 0.04	0.9-1.2	0.15-0.30
GB 3077	42CrMo	0.38-0.45	0.17-0.37	0.5-0.80	≤ 0.035	≤ 0.035	0.9-1.2	0.15-0.25
BS 970	EN19	0.35-0.45	0.15-0.35	0.5-0.80	≤ 0.035	≤ 0.035	0.9-1.5	0.2-0.40

7. 4140 Steel Application
4140steel finds many applications as forgings for the aerospace,oil and gas,automotive, agricultural and defense industries etc.
Typical applications for Scm440 steel uses include:forged gears,spindles,fixtures,jigs,collars,Axles,conveyor parts,crow bars,logging parts,shafts,sprockets,studs,pinions,pump shafts, rams, and ring gears etc

8.Quality control:
1. Melting Process: EAF/BOF+LF+VD resulting in ingots
2. Both ends cut by saw
3. Ratio of forging:minimum 3:1
4. Grain size of final product: according to ASTM E112 more than 5,preferred more than 8
5. Ultrasonic test: As per SEP1921 Class C/c or D/d

9.Heat treatment of  4140 Steel 
Quenched and Tempered (+QT) of 4140 Steel
1. Heat  4140 steel slowly to 840-875°C;
2. Soak at this temperature then quench in oil;
3. Temper as soon as  4140 reach room temperature (20°C);
4. Heat uniformly to the suitable temperature of 560°C;
5. Withdraw the material from the furnace and cool in the air.                                                      
Annealing of  4140 Alloy Steel
1. Heat the  4140 slowly to 800-850°C and allow enough time.
2. Cool slowly in the furnace to 480°C followed by air cooling

10.MOQ: one piece per size/grade

11.Payment term: FOB CIF CFR EXW and so on

12.Delivery time : 7 to 30 days after deposit received.













China Forged Steel Round Bar (ASTM 4140, GB 42CrMo, DIN 42CrMo4)
China Forged Steel Round Bar (ASTM 4140, GB 42CrMo, DIN 42CrMo4)
China Forged Steel Round Bar (ASTM 4140, GB 42CrMo, DIN 42CrMo4)