SAE 4340 Diameter 68mm Length 6m Welded Steel Pipe For Mechanical

Product Specification

SAE 4340 Alloy Steel Tube, Cold Drawn, Diameter 68mm, Length 6m, for Mechanical Service.

Classification methods
Classification of Folding Welding Methods
Spiral welded steel pipe can be divided into arc welding pipe, high frequency or low frequency resistance welding pipe, gas welding pipe, furnace welding pipe, Bondi pipe and so on.
Welding steel pipe: used in petroleum drilling and mechanical manufacturing.
Furnace welding pipe: can be used as water gas pipe, large diameter straight seam welding pipe for high pressure oil and gas transportation, spiral welding pipe for oil and gas transportation, pipe pile, pier, etc.
Folding by weld shape
It can be divided into straight welded pipe and spiral welded pipe
Folding straight seam welded pipe
The production process is simple, the production efficiency is high, the cost is low, the development is fast.
Folding spiral welded pipe
The strength is generally higher than that of straight seam welding pipe, which can produce welded pipe with larger diameter with narrower billet, and can also produce welded pipe with different diameter with the same width of blank. But compared with the straight seam pipe of the same length, the weld length is increased by 30~100%, and the production speed is lower. Therefore, the smaller diameter welded pipe mostly adopts direct seam welding, and the large diameter welded pipe mostly adopts spiral welding.
Spiral welded steel pipe is divided into automatic submerged arc welded steel pipe and high frequency welded steel pipe.
According to the pressure of conveying medium, a. spiral seam automatic submerged arc welded steel pipe can be divided into two categories: class A pipe and class B pipe. The Class A pipe is generally made of common carbon steel Q235,Q235F and common low alloy structural steel 16 Mn welding, and the Class B pipe is made of Q235,Q235F,Q195 and other steel welding, which is used as a low pressure fluid conveying pipe
b. spiral joint high frequency welded steel pipe spiral joint high frequency welded steel pipe, there is no uniform product standard, generally using ordinary carbon steel Q235,Q235F and other steel manufacturing.

Folding by purpose
It is divided into general welding pipe, galvanized welding pipe, oxygen blowing welding pipe, wire casing, metric welding pipe, roller pipe, deep well pump pipe, automobile pipe, transformer pipe, welding thin wall pipe, welding special shape pipe and spiral welding pipe.
Folding general welded pipe
General welded pipes are used to transport low pressure fluids. made of Q195A,Q215A,Q235A steel. It can also be made of other mild steel that is easy to weld. Steel pipe to carry out water pressure, bending, flattening and other experiments, there are certain requirements for surface quality, usually delivery length of 4-10 m, often require a fixed (or double) delivery. The specification of welded pipe is expressed by nominal caliber (millimeter or inch) nominal caliber is different from actual. There are two kinds of common steel pipe and thickened steel pipe according to the prescribed wall thickness, and the steel pipe is divided into two kinds according to the form of pipe end and without thread.
Folding galvanized steel
In order to improve the corrosion resistance of steel pipe, the general steel pipe (black pipe) is galvanized. Galvanized steel pipe is divided into hot galvanizing and electroplating zinc.
Folding oxygen pipe
Used for steelmaking oxygen blowing pipe, generally small diameter welded steel pipe, specifications from 3/8 inch-2 inch eight. made of 08,10,15,20 or Q195-Q235 steel strips. In order to prevent corrosion, some aluminizing treatment.
Folding wire bushing
Also common carbon steel welded steel pipe, used in concrete and various structural distribution projects, commonly used nominal diameter from 13-76 mm.; and The tube wall of wire sleeve is thin, mostly used after coating or galvanizing, cold bending test is required
Folding metric welded tubes
The specification is in the form of seamless pipe, welded steel pipe expressed by outer diameter * wall thickness mm, welded by tropical and cold band of ordinary carbon steel, high quality carbon steel or universal energy low alloy steel, or welded by tropical welding and then cold dial method. Metric welded pipe can be divided into common energy and thin-walled, commonly used as structural parts, such as transmission shaft, or conveying fluid, thin-walled used to produce furniture, lamps and so on, to ensure the strength of steel pipe and bending test.
Folding roller tube
Used for belt conveyor roller welding steel pipe, generally made of Q215,Q235A,B steel and 20 steel, diameter 63.5-219.0 mm. Water pressure and flattening test are generally carried out for the bending degree and the end face should be perpendicular to the center line and ellipticity.
Folding transformer tubes
It is used to manufacture transformer heat pipe and other heat exchangers. It is made of ordinary carbon steel. It requires flattening, expansion, bending and hydraulic test. The steel pipe is delivered with a fixed or double ruler, which has certain requirements for the bending degree of the steel pipe.
Folding profiled tubes
A square tube, rectangular tube, cap tube, empty rubber steel door and window steel pipe welded by ordinary carbon steel and 16 Mn steel strip, mainly used as agricultural machinery member, steel window door, etc.
Folding welded thin-walled tube
Mainly used to make furniture, toys, lamps and so on. At present, the thin-walled tube made of stainless steel strip is widely used, advanced furniture, decoration, fence and so on.

Folding spiral welded pipe
A low carbon carbon structural steel or low alloy structural steel strip is rolled into a tube billet at a certain angle of helix (called forming angle), and then welded into a tube joint. It can produce large diameter steel tubes with narrower strip steel. Spiral welded pipe is mainly used for oil and natural gas pipeline, its specification is expressed by outer diameter * wall thickness. Spiral welded pipe has one-sided welding and double-sided welding, welded pipe should ensure that the hydraulic test, weld tensile strength and cold bending performance to comply with the requirements.
Fold by end shape
Also divided into round welded pipe and irregular (square, flat, etc.) welded pipe.