What is the cause of the fracture of the material SUS301 when bending

1. The material state is hard and easy to break, and the material in the annealed state is selected;

2. The inner angle of bending is too small to concentrate the stress, and the punch chamfering of the bending die;

3. The stamping speed of the equipment is too fast, so slow down the stamping speed or choose equipment with lower speed;

Generally considered from these three aspects.

If the hardness of the material you are using is too high, try it in a different direction and tell me the thickness and hardness of the material you are using if it is convenient.

It will break if it is not heat treated to the best condition.

SUS301 sub-stable austenitic stainless steel is a reinforced stainless steel that is easy to cold deformation, with high strength and hardness after cold working, and still retains sufficient plastic toughness, and has good corrosion resistance under atmospheric conditions.

1. SUS301 corresponding grades: 1. National standard GB-T standard: digital grade:

S30110, new grade: 12Cr17Ni7, old grade: 1Cr17Ni7,2, American standard:

ASTMA Standard: 301, SAE Standard: 30301, UNS Standard:

S30100,3, Japanese standard JIS standard: SUS301,4, German standard DIN standard:,5, European standard EN standard:

x5crni17-7、x3crni17-8。

2. SUS301 chemical composition: carbon C: , silicon Si:, manganese Mn: , phosphorus P: , sulfur S:, chromium Cr:, nickel Ni:, molybdenum Mo:, nitrogen N:-, copper Cu:—, other elements:

3. SUS301 physical properties: density density (20).

kg , melting point :1398 1420 , specific heat capacity (0 100 ) kg (, thermal conductivity w (

100 , thermal conductivity w (

Linear expansion coefficient. 10-6/k)

0 100 , linear expansion coefficient (10-6 k).

Resistivity (20).

.mm2 m), longitudinal modulus of elasticity.

20) GPA: 193, Magnetic: None.

4. SUS301 mechanical properties: Delivery status: bar cutting solution treatment, hot pressure processing without solution treatment, plate solution pickling, tensile strength (RM MPA):

520, Elongation strength (:205, elongation a %: 40, section shrinkage (z %):

60。5. SUS301 heat treatment: Hardness HBW: solid solution 187, hardness HRB: 90, heating temperature: 1010 1150, heating method: fast cooling.

SUS301 applications: Mainly used for equipment and components that bear high loads in cold working and want to reduce equipment weight and rust, such as railway vehicles, conveyor belts, bolts, nuts, fasteners, etc.

1. The material state is hard and easy to break, and the material in the annealed state is selected;

2. The inner angle of bending is too small to concentrate the stress, and the punch chamfering of the bending die;

3. The stamping speed of the equipment is too fast, so slow down the stamping speed or choose equipment with lower speed;

Generally considered from these three aspects.

The bending of stainless steel strip depends on the size of the bending, and the hardness of the bending is relatively large, so it is necessary to buy better materials.

In general, it is considered that the plate is too hard and the ductility is not good, and it is recommended to use 304.

First of all, it is the raw material, and some materials are not suitable for bending. than bai such as du stainless steel 301There is also high-carbon steel.

Those with high hardness are not suitable for bending. There is also the dao you said more about stamping parts, and the stress of the stamped parts is greater. It can't be released, and it just so happens that you bend it so that it is seriously affected by external forces, and it will naturally break.

In addition to the previous mention, there is also a possibility that the rolling direction of the plate is also related.

It's the material reason. Any rolled plate it has anisotropic physical properties. If the bending line is in the same direction as the rolling, cracks are prone to occur at the bend; If the bending line is perpendicular to the rolling direction, cracks are not likely to appear at the bend.

In a word, the quality of the rebar is not up to standard. What is the reason for the disqualification, how can netizens know? It is still necessary to be tested, or tested for its chemical composition carbon C, sulfur S, phosphorus P, silicon Si, manganese Mn and other content.

If you can submit an inspection report, you can get the corresponding answer.

Rebar refers to steel for reinforced concrete and prestressed reinforced concrete, which has a circular cross-section and sometimes a square with rounded corners.

Including round steel bars, ribbed steel bars, and torsion steel bars.

Steel bars are widely used in various building structures, especially in various large, heavy, lightweight thin-walled and high-rise building structures.

Rebar is a strip of steel that is a type of building material. For example, in reinforced concrete, it is used to support the skeleton of the structure.

The tensile resistance of steel bars is not compressive, the compressive resistance of concrete is not tensile resistance, the combination of the two has good mechanical strength, the steel bar is protected by the concrete without rusting, and the steel bar and the concrete have approximately the same coefficient of thermal expansion, and will not produce cracks and corrosion, so it has become an ideal material for modern buildings and has become a widely used reinforced concrete building.

This is a shoddy quality steel bar, and it may be a strip steel. It may be caused by more impurities inside, causing the steel bar to break as soon as it is bent, or even more shoddy steel bars will break if they fall.

The stainless steel of 301 general material will have cracks, but the green mountain material will not.

Qingshan stainless steel is the product of advanced treatment of raw material stainless steel, the chemical composition of P and S content is very low, Qingshan stainless steel is capricious enough, compared with ordinary material stainless steel is more pressure-resistant, strong, heat-resistant, corrosion-resistant.

316L Stainless Steel Bar: 316 stainless steel contains molybdenum and has a low carbon content, and its resistance to pitting corrosion in the marine and chemical industry environment is much better than that of 304 stainless steel! (316L low carbon, 316N nitrogen, high strength, 316F stainless steel with high sulfur content, easy-to-cut stainless steel.)

304L stainless steel bar: As a low-carbon 304 steel, in general, the corrosion resistance is similar to that of 304, but after welding or stress relief, its grain boundary corrosion resistance is excellent, and it can maintain good corrosion resistance without heat treatment.

304 stainless steel bar: has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good hot workability such as stamping and bending, and no heat treatment hardening. Usage:

Tableware, cabinets, boilers, auto parts, medical appliances, building materials, food industry (use temperature -196 °C - 700 ° C).

310 stainless steel bar: the main features are: high temperature resistance, generally used in boilers, automobile exhaust pipes. Other properties are average.

303 stainless steel bar: by adding a small amount of sulfur and phosphorus, it is easier to cut than 304, and other properties are similar to 304.

302 stainless steel bar: 302 stainless steel bar is widely used in auto parts, aviation, aerospace hardware tools, and chemical industry. The details are as follows:

Handicrafts, bearings, slippery flowers, medical instruments, electrical appliances, etc. Characteristics: 302 stainless steel balls belong to austenitic steel, which is close to 304, but the hardness of 302 is higher, HRC 28, and has good rust and corrosion resistance.

301 stainless steel bar: good ductility for molded products. It can also be quickly hardened by machining. Good weldability. The wear resistance and fatigue strength are better than those of 304 stainless steel.

202 stainless steel bar: belongs to chromium-nickel-manganese austenitic stainless steel, and its performance is better than that of 201 stainless steel.

201 stainless steel bar: belongs to chromium-nickel-manganese austenitic stainless steel, with low magnetic properties. 410 stainless steel bar: belongs to martensitic (high-strength chromium steel), good wear resistance, poor corrosion resistance.

To look at the thickness of the board to speak.

The yield strength is not enough. The carbon content is relatively high and relatively hard.

Yield strength: It is the yield limit of the metal material when the yield phenomenon occurs, that is, the stress that resists the slight plastic deformation. For metal materials without obvious yield, the stress value that produces the residual deformation is specified as its yield limit, which is called the conditional yield limit or yield strength.

External forces greater than this limit will cause the parts to fail permanently and cannot be recovered. For example, the yield limit of mild steel is 207MPa, when the external force greater than this limit acts, the parts will produce permanent deformation, less than this, the parts will return to their original appearance.

Yield strength: It is the yield limit of the material when the yield phenomenon occurs, that is, the stress that resists the slight plastic deformation. For materials without obvious yield, the strain value is specified as the corresponding stress value as its yield limit, which is called the conditional yield limit or yield strength.

External forces greater than this limit will cause the parts to fail permanently and cannot be recovered. For example, the yield limit of mild steel is 207MPa, when the external force greater than this limit acts, the parts will produce permanent deformation, less than this, the parts will return to their original appearance.

The yield strength is not enough. The carbon content is relatively high and relatively hard.

What kind of steel is it?

It breaks when subjected to the yield limit.

Steel is divided into tensile value and yield value.

It should be a quality problem, and you can find the manufacturer for compensation.