Cutting refractory stainless steel needle are widely used and have high tensile strength. Using low-carbon alloy as the base material, the cut steel fiber is produced by cold drawing technology at the temperature of metal crystal, and the tensile strength can reach 1150-3000MP.

Cold drawing fibers are thin steel wires within a certain range of lengths and diameters added to strengthen mortar or concrete, commonly used long straight steel fibers with circular cross-sections with a length of 10-60 mm, a diameter of 0.2-0.6 mm, and an aspect ratio of 30-100. In order to increase the interface bonding between fibers and mortar or concrete, various special-shaped steel fibers can be selected, and their cross-sections are rectangular, zigzag, and meniscus; the cross-sectional size changes alternately along the length; corrugated; circular; Enlarged at the end or with a hook, etc. Low-carbon steel fibers can be used to prepare steel fiber concrete applied at room temperature; stainless steel fibers must be used to prepare refractory steel fiber concrete. Adding a proper amount of steel fiber to mortar or concrete can increase its tensile and flexural strength, and greatly improve its toughness and impact strength.

Refractory stainless steel needle is developed in recent years, but its application fields are becoming more and more extensive. Correspondingly, the varieties of steel fiber are also increasing.

1. According to the shape, there are: straight steel fiber, prismatic steel fiber, corrugated steel fiber, hook-shaped steel fiber, big-headed steel fiber, double-pointed steel fiber, clustered steel fiber, etc.

2. Divided according to the cross-sectional shape: circular, rectangular, grooved, and irregular.

3. According to the production process, there are: cutting steel fiber (cutting with thin steel wire); cutting steel fiber (cutting with thin steel plate and strip steel);

Milling steel fiber (cutting with thick steel plate or steel ingot); melting drawn steel fiber (drawing with molten steel). The most promising is the solution drawn steel fiber.

4. Divided by material:Plain carbon steel fiber (the tensile strength is generally 300~2500MPa);Stainless steel fiber (according to the material, there are 304, 310, 330, 430, 446, etc.);Other metal fibers (aluminum, copper, titanium and alloy fibers).

5. According to the classification of construction technology: spraying and pouring.

CHEMIC ELEMENT(%)
SIZE	C	P	Mn	Si	Cr	Ni
AISI330	≤0.40	≤0.04	≤2.00	≤0.75	17~20	33~37
AISI310	≤0.40	≤0.04	≤2.00	≤1.50	24~26	19~22
AISI316	≤0.40	≤0.04	≤2.00	≤1.00	16~18	10~14
AISI314	≤0.40	≤0.045	≤2.00	1.5~3.0	23~26	19~22
AISI309	≤0.40	≤0.04	≤2.00	≤1.00	22~24	12~15
AISI304	≤0.40	≤0.04	≤2.00	≤2.00	18~20	8~10
AISI301	≤0.40	≤0.04	≤2.00	≤2.00	16~18	6~8
AISI201	≤0.40	≤0.06	5.5~7.5	≤1.00	16~18	3.5~5.5
AISI446	≤0.40	≤0.04	≤1.50	≤2.00	23~27
AISI430	≤0.40	≤0.03	≤1.00	≤2.00	16~18
NAS430A	≤0.40	≤0.03	≤0.50	≤0.50	16~18