Large Caliber Square Pipe Factory

Performance Index Analysis of Large Diameter Square Tubes-Plasticity
Plasticity refers to the ability of metal materials to produce plastic deformation (permanent deformation) without failure under load.

Performance Index Analysis ofLarge Diameter Square Tubes-Hardness

Hardness is a pointer to measure the hardness of metal materials. At present, the hardness determination method in production is commonly used as the indentation hardness method, which is to use a certain geometry of the indenter under a certain load into the surface of the metal material being tested, according to the degree of indentation to determine its hardness value. Commonly used methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).

Performance Index Analysis ofLarge Diameter Square Tubes-Fatigue

The strength, plasticity and hardness discussed above are all indicators of the mechanical properties of metals under static load. In fact, many machine parts work under cyclic loads, under which conditions fatigue occurs. The way also needs to have other cross-section shapes of special-shaped steel pipe.

1. Welded steel pipe for low pressure fluid transmission (GB/T3092-1993) is also called general welded pipe, commonly known as black pipe. It is a welded steel pipe used for conveying water, gas, air, oil and heating steam and other general lower pressure fluids and other purposes. The thickness of steel pipe joint wall is divided into ordinary steel pipe and thickened steel pipe; the form of pipe joint end is divided into non-threaded steel pipe (smooth pipe) and threaded steel pipe. The specification of the steel pipe is expressed by the nominal diameter (mm), and the nominal diameter is an approximation of the inner diameter. It is customary to use inches, such as 11/2, etc. Welded steel pipes for low pressure fluid transmission are not only directly used for conveying fluids, but also widely used as raw pipes for galvanized welded steel pipes for low pressure fluid transmission.

Galvanized welded steel pipe for low pressure fluid transmission (GB/T3091-1993) is also called galvanized welded steel pipe, commonly known as white pipe. Is used for conveying water, gas, air oil and heating steam, warm water and other general lower pressure fluid or other uses of hot dip galvanized welding (furnace welding or electric welding) steel pipe. The thickness of steel pipe joint wall is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; the form of pipe joint end is divided into galvanized steel pipe without thread and galvanized steel pipe with thread. The specification of the steel pipe is expressed by the nominal diameter (mm), and the nominal diameter is an approximation of the inner diameter. It is customary to use inches, such as 11/2, etc.

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

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

5. Spiral seam submerged arc welded steel pipe for pressurized fluid transmission (SY5036 -83) is a spiral seam steel pipe for pressurized fluid transmission with hot rolled steel strip coil as tube blank, often warm spiral forming, welded by double-sided submerged arc welding method. Steel pipe bearing capacity, good welding performance, through a variety of strict scientific inspection and testing, safe and reliable use. The steel pipe diameter is large, the transmission efficiency is high, and the investment of laying pipelines can be saved. Pipelines mainly used to transport oil and natural gas.

Large-diameter square tubes areclassified according to production methods

(1) Seamless square pipe hot rolled pipe, cold rolled pipe, cold drawn pipe, extruded pipe, jacking pipe

(2) Welded pipe
(a)Arc welded pipe, electric resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace welded pipe

(b) Straight welded pipe and spiral welded pipe according to welding seam

2. Classified by section shape

(1) simple section steel pipe round steel pipe, square steel pipe, oval steel pipe, triangular steel pipe, hexagonal steel pipe, diamond steel pipe, octagonal steel pipe, semicircular steel circle, other (2) complex section steel pipe equilateral hexagonal steel pipe, five-petal plum blossom steel pipe, double convex steel pipe, double concave steel pipe, melon seed shaped steel pipe, conical steel pipe, corrugated steel pipe, case steel pipe, other

3, according to the classification of wall thickness thin-walled steel pipe, thick-walled steel pipe

4, according to the use of classification Shenao steel seamless square pipe, thermal equipment steel pipe, mechanical industry steel pipe, petroleum, geological drilling steel pipe, container steel pipe, chemical industry steel pipe, special purpose seamless steel pipe-process flow 1, sanitary mirror tube process flow:

Tube blank inspection Stripping inspection Heating piercing Acid pickling Grinding Lubrication Air drying welding head Cold drawing Solution treatment Acid pickling passivation inspection Cold rolling Oil removal Cutting head Air drying Inner polishing Outer polishing Inspection Mark Finished product packaging

2, industrial pipe process flow

Tube blank inspection Stripping inspection Heating piercing acid pickling grinding lubrication Air drying welding head Cold drawing solution treatment Acid pickling passivation inspection

3, welded pipe process flow

unwinding—— flattening—— end shearing and welding—— looper—— forming—— welding—— inner and outer bead removal—— pre-calibration—— induction heat treatment—— sizing and alignment—— eddy current testing—— cutting—— hydraulic inspection—— pickling—— *** final inspection—— packaging
 

Formula for Weight Calculation of Large Diameter Square Pipe
Square tube weight calculation formula: 4* wall thickness *(side length-wall thickness)*7.85
 Rectangular tube weight calculation formula: (perimeter//3.14-wall thickness)* wall thickness *0.02466
Large diameter square tube General material
Q345A：C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.035，S≤0.035;
Q345B：C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.035，S≤0.035;

Q345C：C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.030，S≤0.030，Al≥0.015;

Q345D：C≤0.18，Mn ≤1.70，Si≤0.50，P≤0.030，S≤0.025，Al≥0.015;

Q345E：C≤0.18，Mn ≤1.70，Si≤0.50，P≤0.025，S≤0.020，Al≥0.015;

Q345A, B, C, D and E all contain Nb 0.07, V 0.15, Ti 0.20, Cr 0.30, N 0.012 and Mo 0.10.
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