High Speed Steel T42 Bars

Semih Metals, based in Istanbul, Turkey, has earned a solid reputation as a reliable manufacturer and supplier of top-notch High Speed Steel (HSS) T42 bars. These bars are celebrated for their remarkable hardness, wear resistance, and cutting efficiency. With a strong focus on quality, precision, and the integrity of materials, Semih Metals crafts T42 bars specifically designed for the rigorous demands of toolmaking, machining, and metal cutting industries. Thanks to their advanced production capabilities and extensive metallurgical knowledge, the company guarantees that their T42 bars adhere to strict international standards, ensuring high-speed performance and long-lasting reliability.

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T42 Alloy High Speed Steel Bar

HSS T42 Bars

High Speed Steel T42 Round Rod

What is High Speed Steel T42 Bars ?

High Speed Steel T42, also known as UNS T12008 or M42, is a cobalt-rich grade that primarily consists of carbon (~1.3%), tungsten (~1.5%), molybdenum (~9.5%), chromium (~3.75%), vanadium (~1.15%), and cobalt (~8%). This unique composition grants it exceptional red hardness, wear resistance, and edge retention, making it an excellent choice for high-speed cutting tools. After heat treatment, T42 bars achieve a hardness range of 66–70 HRC, along with impressive toughness and grindability. The alloy retains its cutting efficiency even at high temperatures, minimizing tool deformation and enhancing service life in demanding environments.

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High Speed Steel T42 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 T42 Bars

Aisi No.	Work No.	C.	Si.	Mn.	Cr.	Mo.	V.	W.	Co.
T-42	1.3207	1.28	0.23	0.20	4.15	3.55	3.25	9.5	10.0

Mechanical Properties of High Speed Steel T42 Bars

Density	2.79 g/cm³
Melting Point	640 °C
Proof Stress	270 MPa
Tensile Strength	405 Min MPa
Elongation	12 Min %

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Equivalent Grades of High Speed Steel T42 Bars

Bohler	AISI	BS	IS	JIS	DIN
S 700	T42	BT42	XT125WCo10 CrMo4V3	SKH-57	(1.3207)

Thermal Properties of High Speed Steel T42 Bars

Thermal Expansion	23.10 x10^-6 /K
Modulus of Elasticity	73 GPa
Thermal Conductivity	121-193 W/m.K

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High Speed Steel T42 Bars Types

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Frequently Asked Questions (FAQ)

Can T42 Alloy High Speed Steel Bars Be Heat Treated?

Yes, T42 Alloy High-Speed Steel Bars can be heat treated. They are typically hardened through heat treatment processes like quenching and tempering to enhance hardness, wear resistance, and performance.

Can High Speed Steel T42 Bars Be Welded?

Welding T42 High-Speed Steel Bars is challenging due to their high carbon content and hardness. If welding is required, preheating and post-weld heat treatment are often necessary to prevent cracking and ensure strength.

How Should High-speed Steel T42 Bars Be Stored?

T42 High-Speed Steel Bars should be stored in a dry, cool environment to prevent rust and corrosion. They should be kept off the ground, ideally on wooden or plastic pallets, and protected from moisture and extreme temperatures.

High Speed Steel T42 Bars Uses

T42 bars find extensive use in the production of precision tools like drills, end mills, taps, broaches, reamers, and gear cutters. They are particularly preferred in scenarios that require high cutting speeds and resistance to heat softening. T42 is perfect for machining tough materials such as stainless steel, titanium alloys, and superalloys, where conventional HSS grades might struggle. Its reliable performance under thermal stress makes it a go-to option for both roughing and finishing tasks in the aerospace, automotive, and die-making sectors, where tool reliability is crucial.

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