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Rotary slitting blades for cutting stainless steel coils

Item No.: GSX0110
What is stainless steel? What's the difficulties for cutting stainless steels? How to cut stainless steels? With Goodklife's patent raw material G1, it is highly used for cutting high tensile strength steels, especially for stainless steels.
Stainless acid-resistant steel is referred to as stainless steel. It is composed of two parts: stainless steel and acid-resistant steel. In short, steel that can resist atmospheric corrosion is called stainless steel. Generally speaking, steel with chromium content of more than 12% Cr has the characteristics of stainless steel.
Stainless steel coils
Fig.1 Stainless steel coils
Features: Stainless steel has excellent corrosion resistance, formability, compatibility, and toughness in a wide temperature range.
Matrix tissue classification
1. Ferritic stainless steel. Containing 12% to 30% chromium. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its resistance to chloride stress corrosion is better than other types of stainless steel.
2. Austenitic stainless steel. Containing more than 18% chromium, it also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good overall performance, resistant to corrosion by various media.
3. Austenitic-ferritic duplex stainless steel. It has the advantages of austenitic and ferritic stainless steel, and has superplasticity. Chromium (18-26%) nickel (4-7%), molybdenum (0-4%), copper and iron (2205, 2304 are common duplex alloys)
4. Martensitic stainless steel. High strength, but poor plasticity and weldability. Carbon (0.2-1.0%), chromium (10.5-18%) and iron (410 and 420 are common martensitic alloys)
Table 1 Standard Stainless steel comparison table and density table
China Japan USA Korea Europe Australia Taiwan Density t/m3
12Cr13 SUS403 403 STS403 403 403 7.75
20Cr13 SUS420J1 420 STS420J1 1.4021 420 420J1 7.75
30Cr13 SUS420J2 STS420J2 1.4028 420J2 420J2 7.75
10Cr17 SUS430 430 STS430 1.4016 430 430 7.70
68Cr17 SUS440A 440A STS440A 440A 440A 7.70
06Cr19Ni10 SUS304 304 STS304 1.4301 304 304 7.93
022Cr19Ni10 SUS304L 304L STS304L 1.4306 304L 304L 7.93
06Cr17Ni12Mo2 SUS316 316 STS316 1.4401 316 316 7.98
022Cr17Ni12Mo2 SUS316L 316L STS316L 1.4404 316L 316L 7.98
06Cr18Ni11Ti SUS321 321 STS321 1.4541 321 321 7.93
06Cr18Ni11Nb SUS347 347 STS347 1.455 347 347 7.98

Difficulties for cutting stainless steels:
1. High cutting force and high cutting temperature
This type of material has high strength, large tangential stress and large plastic deformation during cutting, so the cutting force is large. In addition, the material has extremely poor thermal conductivity, which causes the cutting temperature to rise, and the high temperature tends to be concentrated in the narrow and long area near the cutting edge of the tool, thereby accelerating the wear of the tool.

2. Severe work hardening
Austenitic stainless steel and some high-temperature alloy stainless steels are all austenitic structures, which have a high tendency of work hardening during cutting, which is usually several times that of ordinary carbon steel. The tool is cut in the work hardened area, which shortens the tool life.

3. Easy to stick on the knife
Both austenitic stainless steel and martensitic stainless steel have the characteristics of strong chip toughness and high cutting temperature during processing. When the tough chips flow through the rake face, sticking phenomena such as bonding and welding will occur, which will affect the surface roughness of the processed parts.

Goodklife has an independent research and development center, various experiments and testing equipment, and has developed G1, G2, G3 series alloy tool steels, which have high strength, high hardness, high toughness, high wear resistance, and high red hardness. It is suitable for making hot scissors and cold scissors at the same time, and can be used for multiple grinding. The service life is generally 2-3 times that of ordinary materials. Among them, G1 is particularly suitable for cutting high temperature materials and high tensile strength steel, especially stainless steel.
Rotary slitting blades for cutting stainless steel coils
Fig.2 Rotary slitting blades for cutting stainless steel coils
Comparison of cutting performance of G1-ESR with other materials. We choose SCRAP BLADES for reference.
Case 1:
Processed material: Hot rolled carbon steel, thickness from 1,5 mm to 10,0 mm, Maximum tensile strength=1000N/mm²
Blade material: G1-ESR, core hardened at HRC 54-57(HRC 55/56)
Feedback from our clients:
Performance Comparison of G1-ESR with H13 and W302 from Bohler
Fig. 3 Performance Comparison of G1-ESR with H13 and W302 from Bohler
Case 2:
Hot rolled carbon steel from thickness 3,0 mm to 16,0 mm
Maximum tensile strength=900N/mm²
Blade material: G1-ESR, core hardened at HRC 54-57(HRC 55/56)
Feedback from clients in Italy
Cutting performance comparison of G1-ESR with K306 from Bohler
Fig. 4 Cutting performance comparison of G1-ESR with K306 from Bohler
Cutting performance comparison of G1-ESR with K306 from Bohler
Fig.5 Percent comparison
Slitting refers to the use of disc shears to cut wide strips into narrow strips or trim edges. A complete slitting line consists of decoiler, slitter and winder. The decoiler, slitter and winder are driven by separate motors. According to the drive mode of the uncoiler, slitter and winder, different modes of driving the material through the slitter can be distinguished. Which mode to choose depends on the material, the thickness of the sheet and the number of slits.
Slitting units
Fig.6 Slitting Units
1.Straight slitting mode
In this mode, the driven coiler pulls the material from the uncoiler through the slitter. When the uncoiler and slitter are only driven to feed the material into the winder, it is called pull-through slitting. In driving slitting, the slitting machine is also driven during processing. The motors must now be synchronized to maintain a constant speed as the material passes through the production line. The advantage of driven slitting is that it can slit thin plates and improve the edge quality of all thicknesses.
straight slitting mode
2. Free loop slitting mode
In the free loop slitting, the material is allowed to form a free ring between the slitter and the coiler. Now it is necessary to install a tensioning device in front of the coiler to produce a well-wound coil. This method can handle poorly shaped coils.
Free loop slitting mode

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