S690 Powder Steel Length 2500-5500mm

• Type: Special Steel Bar
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Composition: Stainless Steel Scrap
• Technique: Forged
• Shape: Bar
• Surface Treatment: Polished
• Model NO.: powder high speed steel
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
• Application: Die Steel Bar
• Length: 2500-5500mm
• Transport Package: N/M
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7226911000
• Production Capacity: 1000ton/Month

Product Description

PM M4High-speed tool steel is a versatile material that boasts an extraordinary blend of high wear resistance, exceptional impact toughness, and superior bend strength. These impressive attributes stem from the steel's fine grain size, minimized carbides, and immaculate cleanliness. PM M4delivers extended cutting tool life when compared to conventional M1 steel,M2,M7and other less-alloyed high-speed steels. In cold work tooling applications, it significantly outperforms high-carbon, high-chromium die steels such as D2 and D3.

Other Known Names:CPM REX M4 steel^®, ASP 2004, S690

Common Usage

Broaches, End Mills, Punches, Hobs, Fine Blanking, and Forming Dies.

Physical Properties

Density

0.286 lb/in^³ (7806 kg/m^³)

Specific Gravity

7.92

Modulus Of Elasticity

31 x 10 psi (214 GPa)

Machinability

40-45% of a 1% carbon steel

PM M4 High Speed Steel Chemical Composition

						MAXIMUM	TYPICAL
Carbon	Chromium	Tungsten	Molybdenum	Vanadium	Cobalt	Annealed	Tempered
C	Cr	W	Mo	V	Co	Hb	HrC
1.4	4	5.65	5.2	4	-	255	65

PM M4 High Speed Steel Heat Treating

ANNEALING	PREHEAT	AUSTENITIZING	QUENCH	TEMPERING
Temp	Temp	Temp	Medium	Temp
°F	°F	°F		°F
1550/1600	1500/1550	2175/2220	Salt/Oil/Atm	1025/1050

PM M4 High Speed Steel Thermal Treatments

Preheating:
Heat gradually, not exceeding 400°F (222°C) per hour, to 1500-1600°F (816-871°C), then equalize.

Austenizing (High Heat):

Heat swiftly from the preheat stage.

For Cutting Tools:

• Soak for 5 to 15 minutes.
• Furnace: 2150-2175°F (1177-1191°C)
• Salt Bath: 2125-2175°F (1163-1191°C)

For Cold Work Tooling:

• Soak for 20 to 45 minutes.
• Furnace: 1875-2125°F (1023-1163°C)
• Salt Bath: 1850-2100°F (1010-1149°C)

For optimal toughness, use the lowest temperatures. For maximum hot hardness, use the highest temperatures.
Quenching:
Pressurized gas, warm oil, or salt.

For pressurized gas, ensure the furnace has a minimum quench pressure of 4 bars. Achieving a quench rate of approximately 400°F (222°C) per minute down to below 1000°F (538°C) is crucial for attaining the desired properties.

For optimal results in oil quenching, heat until blackening at approximately 900°F (482°C), then allow to cool in still air until reaching 150-125°F (66-51°C).

When using a salt bath, maintain a consistent temperature between 1000-1100°F (538-593°C). Let the metal equalize in the salt, then cool in still air to 150-125°F (66-51°C).

Tempering:

Commence tempering immediately after quenching to ensure maximum durability.
The ideal tempering temperature range is 1000-1100°F (538-593°C). Avoid tempering below 1000°F (538°C). Maintain the steel at the desired temperature for 2 hours, followed by air cooling to ambient conditions. Double tempering is essential, with triple tempering necessary if austenitized at 2100°F (1149°C) or higher.

Annealing:

Annealing should be conducted post hot working and prior to any re-hardening processes.

Heat gradually, not exceeding 400°F per hour (222°C per hour), to a temperature of 1550-1600°F (843-871°C). Maintain this temperature for at least 2 hours or 1 hour per inch (25.4 mm) of thickness. Follow this by a slow cooling process with the furnace, not surpassing 50°F per hour (15°C per hour) until 1000°F (538°C). Finally, continue cooling to ambient temperature either in the furnace or in still air.