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    stainless steel round bar

  • stainless steel round bar
    Stainless steel round steel belongs to the category of long steel and bar. The so-called stainless steel round steel refers to long steel with uniform circular cross section, generally about four meters long. It can be divided into light circles and black sticks. The so-called optical circle refers to the smooth surface, which is treated by quasi-rolling, while the so-called black rod refers to the rough surface, which is directly hot-rolled.
    brief introduction
    Summary
    Stainless steel round bar refers to solid long steel with circular cross section. Its specifications are expressed in millimetres of diameter. For example, "50" means stainless steel round steel with a diameter of 50 millimetres.
    Common materials are 301, 304, 303, 316, 316L, 304L, 321, 2520, 201, 202, etc. Specifications are denoted by diameter as "50", i.e. round steel with a diameter of 50 mm. Round steel can be divided into hot rolling, forging and cold drawing. The specification of hot rolled round steel is 5.5-250 mm.
    Stainless steel round steel has broad application prospects and is widely used in hardware kitchenware, shipbuilding, petrochemical, machinery, medicine, food, electricity, energy, aerospace, building decoration, etc. Seawater equipment, chemical, dyestuff, papermaking, oxalic acid, fertilizer and other production equipment; photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts.
    Type characteristics
    Type characteristics
    Stainless steel round steel can be divided into hot rolling, forging and cold drawing according to production process. The specification of hot rolled stainless steel round steel is 5.5-250 mm. Among them: 5.5-25mm small stainless steel round steel is mostly supplied in bundles of straight bars, often used as reinforcing bars, bolts and various mechanical parts; more than 25mm stainless steel round steel, mainly used for manufacturing mechanical parts or seamless steel tube blanks.
    According to material quality:
    1) 310S stainless steel round steel
    Characteristic: 310S stainless steel is austenitic chromium-nickel stainless steel with good oxidation resistance and corrosion resistance. Because of the higher percentage of chromium and nickel, 310S has much better creep strength, can work continuously at high temperature, and has good high temperature resistance.
    2) 316L stainless steel round steel
    Characteristics: 1) Cold rolled products have good gloss and beautiful appearance;
    2) Due to the addition of Mo, the corrosion resistance, especially pitting corrosion resistance, is excellent.
    3) Excellent high temperature strength;
    4) Excellent work hardening (post-processing weak magnetism)
    5) The solid solution state is non-magnetic.
    3) 316 stainless steel round steel
    Characteristics: 316 stainless steel is the second most widely used steel after 304. It is mainly used in food industry and surgical equipment. Because of the addition of Mo, it has excellent corrosion resistance, atmospheric corrosion resistance and high temperature strength, and can be used under harsh conditions. It has excellent work hardening (non-magnetic).
    4) 321 stainless steel round steel
    Characteristic: Ti element is added to 304 steel to prevent grain boundary corrosion. It is suitable for use at 430 - 900 C. Except that the addition of titanium reduces the risk of corrosion in welds, other properties are similar to 304.
    5) 304L stainless steel round steel
    Property: 304L stainless steel round steel is a variant of 304 stainless steel with low carbon content. It is used for welding occasions. Lower carbon content minimizes the amount of carbides precipitated in the heat affected zone near the weld, and the precipitation of carbides may lead to intergranular corrosion (welding corrosion) of stainless steel in some environments.
    6) 304 stainless steel round steel
    Characteristics: 304 stainless steel is the most widely used Chromium-Nickel Stainless steel. It has good corrosion resistance, heat resistance, low temperature strength and mechanical properties. Corrosion resistance in the atmosphere, if it is industrial atmosphere or heavily polluted areas, it is necessary to clean in time to avoid corrosion.
    Chemical composition of stainless steel round steel
    Difference
    In construction engineering, stainless steel round steel and screw steel are popular terms for different kinds of steel bars. There are five main differences between them:
    Different shapes. The outer surface of stainless steel round steel is smooth; the outer surface of threaded steel has spiral ribs.
    Production standards are different. In the current standard, stainless steel round steel refers to HPB235 steel bar, its production standard is "Hot Rolled Smooth Reinforcement Bar for Reinforced Concrete" (GB13013); Thread steel generally refers to HRB335 and HRB400 steel bar, its production standard is "Hot Rolled Ribbed Reinforcement Bar for Reinforced Concrete" (GB1499).
    The strength is different. The design strength of stainless steel round steel (HPB235) is 210 MPa; the strength of threaded steel is higher than that of stainless steel round steel; the design strength of HRB335 is 300 MPa; and the design strength of HRB400 is 360 MPa.
    Steel is different (chemical composition is different). Stainless steel round steel (HPB235) is carbon steel, steel grade is Q235; thread steel is low alloy steel, HRB335 steel bar is 20MnSi (20MnSi); HRB400 steel bar is 20MnSiV or 20MnSiNb or 20MnTi, etc.
    Physical and mechanical properties are different. Because of the difference of chemical composition and strength of reinforcing bars, the physical and mechanical properties of reinforcing bars are different. The cold bending performance of stainless steel round steel is better, it can be used as 180 degree bending hook, and screw steel can only be used as 90 degree straight hook; the weldability of stainless steel round steel is better, using ordinary carbon welding rod can be used, screw steel should use low alloy welding rod; the toughness and fatigue resistance of screw steel is better than that of stainless steel round steel. Thread steel is generally used in the construction of reinforced concrete facilities. Its material is generally low-alloy steel grade 16Mn (16Mn low-alloy steel), or carbon-bonded steel 45. Their yield strength is above 350 Mpa, and their tensile strength is above and below 500 Mpa, which is much higher than that of ordinary low-carbon stainless steel round steel (heat-treated threads). The strength of steel is nearly twice or even higher than that of low carbon stainless steel round steel. Because of the thread shape of the surface, the solid bonding with concrete can be increased. Thread steel should be preferred for longitudinal reinforcement and stirrup of concrete members.

    综上所述:
    由于螺纹钢为低合金钢,其价位高于低碳不锈钢圆钢,承建单位、或设计单位,往往对一般的民用建筑的"实用性"角度出发,降低工程质量定位,而选用低碳不锈钢圆钢替代螺纹钢.对于大型重点工程,往往出现买通"工程监检员后",以不锈钢圆钢替换罗纹钢"进行抽梁换柱",降低建造成本.在设计方面,由于构件不许要箍筋提供"主应力支持",主要作用是为"纵筋保持形状和位置",不锈钢圆钢有光滑的表面,捆扎定位准确,所以,除纵筋外,许可使用圆做钢箍筋。而纵筋必须一律使用罗纹钢。


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    Company Address: No. C5-330, Phase II, Dongfang Steel City, Xishan District, Wuxi City


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