Stamping materials
Posted in 2024-08-27 17:29:06 in Tech Blog, 0 Comments
Stamping materials are an important factor affecting the quality of parts and the life of molds. At present, the materials that can be stamped are not only low-carbon steel, but also stainless steel, aluminum and aluminum alloys, copper and copper alloys, etc. Generally, materials with a carbon content of <0.25% and a tensile strength of less than 650N/mm² are used. For example, cold-rolled steel SPCC (JIS) or 1010 (SAE).
Stamping performance requirements for metal materials:
1. Good mechanical properties and large deformation capacity.
The mechanical properties of metal materials refer to tensile strength, yield strength, elongation, hardness, and plastic strain ratio.
2. Ideal metallographic structure
Metallographic structure is the microscopic quality characteristic of the material. Its main characteristics are: the degree of spheroidization of cementite or carbide.
The common structural steel in the Japanese steel (JIS series) grade is mainly composed of three parts:
The first part indicates the material, such as: S (Steel) for steel, F (Ferrum) for iron;
The second part indicates different shapes, types, and uses,
such as: P (Plate) for plate, T (Tube) for tube, K (Kogu) for tool;
The third part indicates the characteristic number, which is generally the minimum tensile strength.
For example: SS400-the first S stands for steel (Steel), the second S stands for "Structure" (Structure), 400 is the lower limit tensile strength of 400MPa, and the whole indicates a common structural steel with a tensile strength of 400MPa.
SPHC-the first S is the abbreviation of Steel, P is the abbreviation of Plate, H is the abbreviation of Heat, and C is the abbreviation of Commercial. The whole indicates general hot-rolled steel plates and strips.
SPHD-indicates hot-rolled steel plates and strips for stamping.
SPHE——indicates hot-rolled steel sheets and strips for deep drawing.
SPCC--indicates cold-rolled carbon steel sheets and strips for general use, equivalent to China Q195-215A grade. The third letter C is the abbreviation of Cold. When tensile test is required, add T at the end of the grade to make SPCCT.
SPCD——indicates cold-rolled carbon steel sheets and strips for stamping, equivalent to China 08AL (13237) high-quality carbon structural steel.
SPCE——represents cold-rolled carbon steel sheets and strips for deep drawing, equivalent to China 08AL (5213) deep drawing steel. When non-aging is required, add N at the end of the grade to make SPCEN.
Tempering code for cold-rolled carbon steel sheets and strips: A for annealing state, S for standard tempering, 8 for 1/8 hardness, 4 for 1/4 hardness, 2 for 1/2 hardness, and 1 for hardness.
Surface processing code: D for matte finishing and B for bright finishing. For example, SPCC-SD represents standard tempering and matte finishing for general cold-rolled carbon sheets. Another example is SPCCT-SB, which represents standard tempering and bright processing, and requires mechanical properties to be guaranteed.
The JIS mechanical structure steel grade is represented as: S+carbon content+letter code (C, CK), where the carbon content is represented by the middle value × 100, and the letter C: represents carbon K: represents carburizing steel. For example, the carbon content of carbon steel coil S20C is 0.18-0.23%.
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