Pm115/Cpm Magnacut Material Powder Metallurgy Stainless Steel Black Surface Forging Steel Hot Rolled Steel Flat Bar Round Bar

• 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 stainless 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
• Material: HSS
• Usage: Gear Hob
• Customized Support: OEM
• Transport Package: N/M
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7226911000
• Production Capacity: 1000ton/Month

Product Description

Detailed Photos

Product Description

 

CPM MagnaCut is a unique powder metallurgy stainless tool steel with a design which eliminates chromium carbide in the heat treated microstructure. An excellent combination of toughness and wear resistance is achieved by having only small, high hardness, vanadium and niobium carbides, giving CPM MagnaCut properties similar to non-stainless steel CPM 4V. Being free from chromium carbide also leads to improved corrosion resistance. This product offers an excellent combination of properties for knives.
 

	Vanadium	Niobium	Chromium	Total
MagnaCut*	6.5%	1.5%	0%	8.0%
S35VN**	2.0%	0.5%	10.5%	13.0%
S45VN**	2.0%	0.5%	12.5%	15.0%
4V*	8%		0%	8%
S90V*	9%		13%	22%
CPM 154*			16%	16%

  
Chemical Composition:

MagnaCut	Carbon	Chromium	Vanadium	Molybdenum	Niobium	Nitrogen
	1.15%	10.7%	4.00%	2.00%	2.00%	0.20%

                     
Physical Properties :
Density 0.28 lbs./in3 (7.76 g/cm3) Thermal Conductivity BTU/hr-ft-°F W/m-°K cal/cm-s-°C 200°F 93°C 10.8 18.6 4.4 X 10-2 Coefficient of Thermal Expansion °F °C in/in/°F mm/mm/°C 70 - 400 (20 - 200) 6.4 X10-6 (11.6 X10-6)

Mechanical Properties :
Toughness:

Grade	HRC	Toughness(ft-lbs)
MagnaCut	62.5	38
MagnaCut	64	30
4V	62	36
CPM154	60	26
S35VN	61	25
S45VN	61.5	19
S90V	61	17
20CV	62	15

 
The excellent toughness results indicate that CPM MagnaCut is very resistant to chipping and breaking. In knifemaking, the high toughness makes it especially good for bigger blades. And fine cutting knives can have thinner edges for better cutting ability with reduced risk of chipping.
Edge Retention (CATRA Testing Relative to 440C)

Grade	HRC	%
MagnaCut	62.5	135
S90V	61.5	195
20CV	61.5	155
S45VN	61.5	140
S35VN	61	130
CPM 154	61	120
440C	56	100

Thermal Treatments:
Forging: 2100°F (1150°C) Do not forge below 1750°F (950°C).

Annealing: 
Heat to 1650°F (900°C), hold 2 hours, slow cool no faster than 25°F (15°C) per hour to 1100°F (595°C), then furnace cool or cool in still air to room temperature.

Annealed Hardness: About BHN 235

Stress Relieving Annealed Parts: 
Heat to 1100-1300°F (595-705°C), hold 2 hours, then furnace cool or cool in still air.
Hardened Parts:
Heat to 25-50°F (15-30°C) below original tempering temperature, hold 2 hours, then furnace cool or cool in still air.

Straightening:
Best done warm 400-800°F (200-425°C) Hardening Preheat: Heat to 1550-1600°F (845-870°C) Equalize.

Austenitize:
1950-2200°F (1065-1205°C), hold time at temperature as shown in chart. Thick cross-sections and larger pieces may need longer austenitizing time.

Quench:
Plate quench, air or positive pressure quench (2 bar minimum) to below 125°F (50°C), or salt or interrupted oil quench to about 1000°F (540°C), then air cool to below 125°F (50°C).

Cold Treatment:
A cold treatment may be used after the quench to decrease retained austenite and increase hardness. Tempering before the cold treatment decreases the effectiveness of the cold treatment but also decreases the chance of warping or cracking. A freezer treatment at -10°F (-23°C) has no effect unless performed directly after the quench with no delay.

Temper:
Double temper at 300-450°F (150-230°C). Hold for 2 hours minimum each time. NOTE: Tempering above 750°F (400°C) results in a decrease in corrosion resistance.

Size Change:
+0.05 to +0.10% when fully martensitic. The presence of retained austenite may reduce the net growth. When tempering at 300-750°F (150-400°C), freezing treatments may be necessary to minimize retained austenite.

Recommended Heat Treatment:
Austenitize 2050°F (1120°C). Quench to below 125°F (50°C). Double temper at 350°F (175°C) 2 hrs. minimum each temper. Cool to hand warm between tempers. A freeze treatment may be added after the quench.
Aim hardness: 60-63 HRC.