Q345B rectangular seamless steel pipe 150 * 110 * 10

1. Performance index analysis of rectangular tube - plasticity

Plasticity refers to the ability of metal materials to undergo plastic deformation (permanent deformation) under load without failure.

2. Performance index analysis of rectangular tube - hardness

Hardness is a pointer to measure the softness and hardness of metal materials. The most commonly used method for measuring hardness in production is the indentation hardness method, which uses a certain geometric shape of the indenter to press into the surface of the tested metal material under a certain load, and determines its hardness value based on the degree of pressing.

The commonly used methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC), and Vickers hardness (HV).

3. Performance index analysis of rectangular tube - fatigue

The strength, plasticity, and hardness discussed earlier are all indicators of the mechanical properties of metals under static loads. In fact, many machine parts work under cyclic loads, and under these conditions, the parts will experience fatigue. The road also requires special-shaped steel pipes with other cross-sectional shapes.

1. Welded steel pipes for low-pressure fluid transportation (GB/T3092-1993), also known as general welded pipes, commonly known as black pipes. It is a welded steel pipe used for transporting generally low-pressure fluids such as water, gas, air, oil, and heating steam, as well as for other purposes. The wall thickness of steel pipes is divided into ordinary steel pipes and thickened steel pipes; The form of the connecting end is divided into non threaded steel pipe (plain pipe) and threaded steel pipe. Welded steel pipes for low-pressure fluid transportation are not only directly used for transporting fluids, but also widely used as raw pipes for galvanized welded steel pipes for low-pressure fluid transportation.

2. Galvanized welded steel pipes for low-pressure fluid transportation (GB/T3091-1993), also known as galvanized welded steel pipes, commonly known as white pipes. It is a hot-dip galvanized welded (furnace welding or electric welding) steel pipe used for transporting water, gas, air oil, heating steam, warm water and other generally low-pressure fluids or other purposes. The wall thickness of steel pipes is divided into ordinary galvanized steel pipes and thickened galvanized steel pipes; The types of takeover ends are divided into non threaded galvanized steel pipes and threaded galvanized steel pipes. The specifications of steel pipes are expressed in nominal diameter (mm), which is an approximate value of the inner diameter. It is commonly expressed in inches, such as 11/2.

3. Ordinary carbon steel wire conduit (GB3640-88) is a steel pipe used to protect wires in electrical installation projects such as industrial and civil buildings, and installation of machinery and equipment.

4. Straight seam welded steel pipe (YB242-63) is a steel pipe with a weld seam parallel to the longitudinal direction of the steel pipe. Usually divided into metric welded steel pipes, welded thin-walled pipes, transformer cooling oil pipes, etc.

5. Spiral seam submerged arc welded steel pipe (SY5036-83) for pressurized fluid transportation is a spiral seam steel pipe made of hot-rolled steel strip coil as pipe blank, formed by constant temperature spiral forming, welded by double-sided submerged arc welding method, and used for pressurized fluid transportation. Steel pipes have strong pressure bearing capacity and good welding performance. After various rigorous scientific inspections and tests, they are safe and reliable to use. The steel pipe has a large diameter, high conveying efficiency, and can save investment in laying pipelines. Mainly used for pipelines transporting oil and natural gas.

1. Classified by production method

(1) Seamless pipe - hot-rolled pipe, cold-rolled pipe, cold drawn pipe, extruded pipe, top pipe (2) Welded pipe (a) Classified by process - arc welded pipe, resistance welded pipe (high-frequency, low-frequency), gas welded pipe, furnace welded pipe (b) Classified by weld seam - straight seam welded pipe, spiral welded pipe

2. Classified by cross-sectional shape

(1) Simple section steel pipe - circular steel pipe, square steel pipe, elliptical steel pipe, triangular steel pipe, hexagonal steel pipe, diamond steel pipe, octagonal steel pipe, semi-circular steel circle, others (2) Complex section steel pipe - unequal hexagonal steel pipe, five petal plum blossom shaped steel pipe, double convex steel pipe, double concave steel pipe, melon seed shaped steel pipe, conical steel pipe, corrugated steel pipe, watch case steel pipe, others

3. Classification by wall thickness - thin-walled steel pipe, thick walled steel pipe

4. Classified by purpose - steel pipes for pipelines, thermal equipment, mechanical industry, petroleum and geological drilling, container steel pipes, chemical industry steel pipes, special purpose steel pipes, others