Asp Rex *** Stainless Steel Sheet Specification

• 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 M4This high-speed tool steel is a remarkably versatile material that offers a distinctive blend of high wear-resistance, exceptional impact toughness, and superior bend strength. These attributes stem from its fine grain size, minimal carbides, and outstanding purity. PM M4It provides enhanced cutting tool longevity when compared to conventionally-wrought M1 steel.M2, M7and other lower-alloyed high-speed steels. It is particularly outstanding in cold work tooling applications, surpassing high-carbon, high-chromium die steels like D2 and D3 in performance and durability.

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/in³ (7806 kg/m³)

Specific Gravity

7.92

Modulus Of Elasticity

31 x 10⁶ 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 at a rate not exceeding 400°F per hour (222°C per hour) until the temperature reaches 1500-1600°F (816-871°C), then equalize.

Austenizing (High Heat):

Heat quickly from the preheat stage.

For Cutting Tools:

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

To maximize toughness, utilize the lowest temperature setting. To enhance hot hardness, opt for the highest temperature setting.
Quenching:
Employ pressurized gas, warm oil, or salt for quenching.

For pressurized gas quenching, the furnace should maintain a minimum quench pressure of 4 bars. An optimal quench rate of approximately 400°F (222°C) per minute down to below 1000°F (538°C) is essential to achieve the desired material properties.

For oil quenching, heat until the metal turns black, approximately reaching 900°F (482°C). After achieving this temperature, let it cool naturally in still air until it reaches a temperature between 150-125°F (66-51°C).

When using a salt bath, maintain a consistent temperature range of 1000-1100°F (538-593°C). Ensure the metal is equalized in the salt bath before letting it cool in still air to a temperature between 150-125°F (66-51°C).

Tempering Process:

Begin the tempering process immediately after quenching to ensure optimal results.
The optimal tempering temperature range is 1000-1100°F (538-593°C). It is crucial not to temper below 1000°F (538°C). Maintain the chosen temperature for 2 hours, followed by air cooling to reach ambient temperature. Double tempering is mandated for structural integrity. For austenitizing at 2100°F (1149°C) or higher, triple tempering is necessary.

Annealing Process:

Annealing is essential post hot working and prior to re-hardening to ensure the material's properties are optimized.

Heat the material at a controlled rate not exceeding 400°F per hour (222°C per hour) until it reaches a temperature range of 1550-1600°F (843-871°C). Hold this temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum of 2 hours. Subsequently, let it cool gradually within the furnace at a rate not exceeding 50°F per hour (15°C per hour) until it reaches 1000°F (538°C). Complete the cooling process to ambient temperature either in the furnace or in air.