Hot rolled strip

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Hot rolled strip

1, hot rolled ordinary carbon structural steel (GB3524-83)

Hot rolled plain carbon steel with ordinary carbon structural steel as material,made of 1.80-6.00mm hot rolled strip thickness, width of 50-1200mm.

1) the main purposes

(2) grade and chemical composition of materials

Standards and grades

National standard

Quite foreign standard

Function and use

Material categories

The implementation of standards

Grade

Standard No.

Grade

Suitable for manufacturing of cold forming parts

Low carbon steel coil

Q/BQB302

SPHC

JISG3131

SPHC

SPHD

SPHD

SPHE

SPHE

SAE1006/SAE1008

SAE1006/SAE1008

XG180IF/200IF

XG180IF/200IF

Steel for general structure

GB/T912-1989

Q195

JISG3101

SS330

For general construction of buildings, bridges, ships, vehicles, etc.

Q235B

SS400

SS400

SS490

ASTMA36

SS540

Mainly used for cold rolling blank, cold-formed steel billet, welded steel pipebillet and bicycle, hardware products manufacturing.


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Q:What are the categories of strip steel? How do you distinguish it?
Classification by usageAccording to the use of steel, can be divided into structural steel, tool steel, special performance steel three major categories.Structural steel: 1. used as steel for various machine parts. It includes carburizing steel, Quenched and tempered steel, spring steel and rolling bearing steel.2. steel used as an engineering structure. It consists of carbon steel in armour, B, especially steel and ordinary low alloy steel.Tool steel: steel used to make all kinds of tools. According to the use of different tools can be divided into tool steel, die steel and tool steel.Special performance steel: steel with special physical and chemical properties. Can be divided into stainless steel, heat-resistant steel, wear-resistant steel, magnetic steel and so on.
Q:What are the differences between strip steel and round steel? Where are they mainly used?
Round steel is a solid strip of steel whose cross section is round. The specifications are expressed in millimeters of diameter, such as "50", which means a round bar of 50 millimeters in diameter. Round bar is divided into three parts: hot rolling, forging and cold drawing. Standard Specification for hot rolled round steel is 5.5-250 mm. Of which: 5.5-25 mm small round bars are mostly supplied by straight strips. They are used as reinforcing bars, bolts and various mechanical parts. Round bars larger than 25 millimeters are used mainly for making mechanical parts or for seamless steel tubes.Mainly used in the manufacture of various tools, cutting tools, moulds and tools (see tool steel), but also a large number of used in the manufacture of various mechanical parts.
Q:What's the difference between strip 235 and 235b?
Q235 is Q235a, Q235 material according to the sulphur and phosphorus content from high to low is divided into ABCD four grades, grade a sulfur phosphorus was the highest relative performance (welding, plasticity) is the worst, D performance is the highest, the lowest content of parathion
Q:Hot rolled strip, the theory of the thinnest, how thin rolling, why not rolling too thin, is the material or the reasons for plate shape?
Tangshan Iron and steel production line design capacity of 0.8mm, the thin can be rolled to 1.8 or limited production, steel level, the purity of molten steel are related, and also there is a certain relationship between the plate width.
Q:What's the meaning of "double light" in strip cold rolling?
Cold: cold rolled steel is cold-rolled steel production. Cold rolling at room temperature under the conditions of No.1 steel plate further rolling thin thickness steel plate. Compared with hot-rolled steel, cold-rolled steel plate thickness is more accurate, and the surface is smooth and beautiful, but also has superior mechanical properties, especially the processing performance because of cold rolled. The volume relatively brittle and hard, not suitable for processing, so typically cold rolled steel demand after annealing, pickling and smooth surface will be delivered to customers. The maximum thickness of cold rolling is below 0.1--8.0MM, most of the factories such as cold rolled steel plate thickness is below 4.5MM; minimum thickness, width is according to the plant equipment capacity and market demand and decision.
Q:What is the cause of the deviation of the strip in the rolling process? How to deal with it?
Strip edge control device, fault, deviation device, tube or mirror surface pollution or other objects covered, so that the deviation of the device failure, resulting in the first line of deviation
Q:Hot rolled strip and hot rolled strip are also sealing plates? What's their function?
Secondly, strip and steel strip should be about the same, no less than a narrow strip of steel bar, the equipment configuration is the same
Q:Can the tension leveller eliminate the wave shape of strip steel completely?
Deformation of strip in tension and bending. There are two sides of the strip wave, the edge of the long fiber and short fiber into the middle; stretching and straightening machine Zhang Ligun, high tension length of the fiber are elastic deformation, the deformation is in the same length; bending roll, tensile and bending interaction length of the fiber plastic the deformation happened, Wuxi Tiangong metallurgical production straightening machine total length is still the same, which is different from the original long fiber produced by plastic deformation is small, the original short fiber produced by large plastic deformation; tension and bending stress to remove all strip elastic deformation recovery, leaving only the plastic deformation, then the original short fiber than long fibers obtained permanent large plastic deformation, long fiber length and narrow the gap, but still a long long fiber, short fiber is still relatively short.
Q:What are the advantages of cold rolling and cold rolling strip steel?
What to do with cold rolling is better than that of hot rolling, which is the main one because cold rolling is processed by hot rollingCold: hot rolled steel coil as raw material by pickling descaling after cold rolling, the finished rolling hard volumes, due to continuous deformation caused by cold hardening the volume rolling hard strength, hardness, toughness index rise decline, so the stamping performance will deteriorate, only for a simple deformation of parts.Cold rolled steel strip and sheet thickness is generally 0.1 ~ 3mm, width 100 ~ 2000mm in hot strip steel or timber as raw material, under normal temperature after cold rolling, cold rolled steel strip and sheet has the advantages of smooth surface, smooth, high precision and good mechanical properties.
Q:Where is the good quality of galvanized steel strip?
Strip steel is widely used in the production of welded steel pipe, made of cold formed steel billet, manufacturing bicycle frame, rim, clamp, gasket, spring, saw blades, hardware and blades.

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