High Speed Steel M42 Bars

Aiman Metals, having its roots in Kuala Lumpur, Malaysia, is a reliable producer and supplier of high-quality metal products, providing state-of-the-art precision engineering solutions that cater to various industrial demands. With its focus on quality and innovation, the company has established itself as a performer that ensures high-performing and reliable materials across industry segments including automotive, aerospace, and general manufacturing. Among its premium products, High-Speed Steel (HSS) M42 Bars are extremely popular for their excellent hardness, cutting, and wear resistance. Developed to perform under challenging conditions, these bars cater to high-performance tooling and machining requirements, providing durability, precision, and superior productivity in industrial uses.

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M42 Alloy High Speed Steel Bars

High Speed Steel M42 Round Rods

M42 Alloy High Speed Steel Bright Bars

What is High Speed Steel M42 Bars ?

High-Speed Steel M42 Bars are a cobalt-alloyed product that is famous for exceptional hardness and cutting strength. The alloy contains some 1.05% Carbon, 4.0% Molybdenum, 8.0% Cobalt, 2.0% Vanadium, and 1.0% Tungsten, with trace Chromium and Manganese for improved performance. These materials blend to produce exceptional wear resistance and red-hardness, maintaining edge retention in high-heat conditions. In terms of mechanics, M42 bars have a Rockwell hardness of 68–70 HRC with good toughness and thermal softening resistance. Their higher strength, toughness, and capacity for performance under high-stress conditions make them the best choice for heavy-duty machining and high-precision tooling applications.

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High Speed Steel M42 Bars Specifications

Standard : ASTM A600, ASME SA600
Dimensions : EN, DIN, JIS, ASTM, BS, ASME, AISI
Form : Round
Diameter : 2mm to 100mm depending on grades
Length : 100 mm to 10,000 mm
Surface Condition : Black, Grinded, Turned Bright, Machined Proof
Application : Lathe Tools, Milling Cutter, Cutter Blades, Boring Tools, Twist drills, Milling Knives, Reamers, Taps, Metalcutting saws, Screw Cutting Tools, File Cutter’s Chissels, Drills, Hobs, Drill Bits, Tread cutting tools etc

Chemical Compositions of High Speed Steel M42 Bars

ASTM A600	C		Mn		P	S	Si		Cr		V		Mo		W		Co
M42	1.05	1.15	0.15	0.40	0.03	0.03	0.15	0.65	3.50	4.25	0.95	1.35	9.00	10.00	1.15	1.85	7.75	8.75
DIN ISO 4957	C		Mn		P	S	Si		Cr		V		Mo		W		Co
1.3247/HS2-9-1-8	1.05	1.15	…	…	…	…	…	0.70	3.50	4.50	0.90	1.30	9.00	10.00	1.20	1.90	7.50	8.50
JIS G4403	C		Mn		P	S	Si		Cr		V		Mo		W		Co
SKH59	1.05	1.15	…	0.40	0.03	0.03	…	0.70	3.50	4.50	0.90	1.30	9.00	10.00	1.20	1.90	7.50	8.50

Mechanical Properties of High Speed Steel M42 Bars

Mechanical Properties	Metric	Imperial
Hardness, Rockwell C (oil quenched from 1204°C, 5 minutes)	64.3	64.3
Hardness, Rockwell C (oil quenched from 1177°C, 5 minutes)	65.5	65.5
Hardness, Rockwell C(oil quenched from 1163°C)	65.8	65.8
Izod impact unnotched (oil quenched at 1191°C; 510°C temper temperature)	13.6 J	10.0 ft- lb
Izod impact unnotched (oil quenched at 1191°C; 622°C temper temperature)	24.4 J	24.4 J
Machinability (1% carbon steel)	35.0 – 40.0%	35.0 – 40.0%
Poisson’s ratio	0.27-0.30	0.27-0.30
Elastic modulus	190-210 GPa	27557-30457 ksi

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Equivalent Grades of High Speed Steel M42 Bars

Country	USA	German	Japan
Standard	ASTM A600	DIN EN ISO 4957	JIS G4403
Grades	M42	1.3247/HS2-9-1-8	SKH59

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High Speed Steel M42 Bars Types

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Frequently Asked Questions (FAQ)

Can High-speed Steel M42 Be Welded?

Yes, High-Speed Steel M42 can be welded, but it requires specialized techniques like preheating, post-weld heat treatment, and using appropriate filler materials to avoid cracking and maintain its properties.

Are High Speed Steel M42 Bars Recyclable?

Yes, High Speed Steel M42 bars are recyclable. They can be melted and reused in manufacturing, reducing waste and conserving resources, making them an environmentally friendly material choice.

How Should High-speed Steel M42 Bars Be Stored?

High-Speed Steel M42 bars should be stored in a dry, cool environment, protected from moisture and corrosion. Ensure they are placed on clean, stable surfaces to prevent damage and maintain quality.

High Speed Steel M42 Bars Uses

High-Speed Steel M42 Bars find extensive application in manufacturing high-performance cutting tools like end mills, reamers, taps, drills, and saw blades where high hardness and heat resistance are needed. The high cobalt content offers superior red-hardness, enabling tools to retain sharpness and accuracy even at high speeds and temperatures. This makes them very suitable for high-speed machining and intricate metalworking operations. M42 is also used in die and mold making, heavy-duty machining, and tooling for aerospace and automotive applications. Its toughness, edge retention, and wear resistance provide extended tool life, lower downtime, and improved productivity in harsh industrial conditions

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