Scm440 / En19 / 42CrMo4 / 1.7225 / 4140 Hot Rolled Forged Cold Drawn Steel Round Square Bar

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Scm440 / En19 / 42CrMo4 / 1.7225 / 4140 Hot Rolled Forged Cold Drawn Steel Round Square Bar

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Product Description

📊 Basic Information

Model NO.

SCM440 / EN19 / 42CrMo4 / 1.7225

Technique

Cold Drawn

Application

Structural/Tool/Die Steel Bar

Surface Treatment

Cold Drawn Bright

Alloy

Special Use

Mold/Free Cutting Steel

Tolerance

H9 H10 H11

Shape

Round, Square, Hex, Special

MOQ

2 tons

Production

3000 tons/Month

🔧 Product Description

Scm440 / En19 / 42CrMo4 / 1.7225 / 4140 Hot Rolled Forged Cold Drawn Steel Round Square Bar

AISI 4140 alloy steel is chromium, molybdenum, manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. 4140 alloy steel material is a high quality Quenched and Tempered Alloy Structural steel, belonging to the high quality medium carbon alloy steel.

Delivery Condition Choice: Hot Rolled, Cold Drawn, Forged, Q&T (Quenched and Tempered), Annealed/Normalized.

Full Size Range:
- Hot Rolled 4140: Ø16mm-310mm
- Forged 4140: Ø200mm-1200mm
- Cold drawn 4140: Ø12-100mm
- Q&T 4140: Ø16-310mm

📋 Equivalent Grades

GB/YB (China)	JIS (Japan)	DIN (Germany)	AISI/ASTM	BS (UK)	NF (France)
42CrMo	SCM440	42CrMo4-1.7225	4140	EN19 / 708M40	42CD4

🧪 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
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
EN10083	1.7225	0.38-0.45	≤0.4	0.6-0.90	≤0.025	≤0.035	0.9-1.2	0.15-0.30

💪 Physical Properties

Tensile Strength (Rm,MPa)	Yield Strength (Rel,MPa)	Elongation (A,%)	Reduction (Z,%)	Impact Energy (Aku,J)	HBW (Annealed)
≥1080	≥930	≥12	≥45	≥63	≤217

✅ Quality Control

Gas content level: O2 < 20 ppm, H2 < 2 ppm, N2 < 100 ppm
Grain Sizes: 5-8
Advanced Processing: Converter/Electric Furnace -> Refining -> VD/RH -> Continuous Casting -> Hot Rolling
Full UT (Ultrasonic Test) Check and processing center distribution

🚀 Main Applications

4140 steel is used for engineering structures such as high tensile shafts, bolts and nuts, gears, pinions, and spindles. It is also ideal for locomotive traction gears, supercharger drive gears, pressure vessels, rear axles, connecting rods, spring clips, and oil drill pipe joints (for wells under 2000m deep).

❓ Frequently Asked Questions

What are the main characteristics of Scm440/4140 steel?

It is a chromium-molybdenum alloy steel with high fatigue strength, excellent abrasion and impact resistance, and high torsional strength.

What is the hardness of 4140 steel after quenching?

After oil quenching and tempering, the hardness typically reaches 28-34 HRC. In the annealed state, the hardness is less than 250HB.

Can you provide custom lengths for the steel bars?

Yes, we maintain stocks from 6m to 10m and can also provide fixed cutting services for specific short length requirements.

Is the steel tested for internal defects?

Yes, all products undergo UT (Ultrasonic Test) checking to ensure internal integrity and quality before processing and distribution.

What surface finishes are available?

We offer multiple finishes including Hot Rolled, Cold Drawn Bright, and forged surfaces depending on the application requirements.

What is your monthly production capacity for these bars?

Our current production capacity is approximately 3000 tons per month, ensuring stable supply for large-scale projects.

Scm440 / En19 / 42CrMo4 / 1.7225 / 4140 Hot Rolled Forged Cold Drawn Steel Round Square Bar

Product Description

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