BS 1139 Scaffolding Tube







Determination of chemical composition of steel by ladle analysis

Carbon	≤0.20
Silicon	≤0.30
Phosphorus	≤0.05
Sulphur	≤0.05
Nitrogen	≤0.009

 

Mechanical Property

Tensile strength	Rm	N/mm2	≥340; ＜480
Yield stress	ReH	N/mm2	≥235
Elongation	A		≥24%
(on Lo = 5.65√So)ª

 

Nominal dimensions, mass and tolerances for tubes

Tube	Nominal values "Type 4.0"	Tolerances
Wall thickness	4.0mm	－10.0%
Outside diameter(including ovality)	48.3mm	±0.5mm
Inside diameter	40.3mm	－2.6mm
Mass, single tube	4.37kg/m	+12.0%; －8.0%
Mass, batches of tubes(10 tonnes or more)	4.37kg/m	±7.5%

ASTM A252 SSAW Piling Pipe




 

 

	Grade 1	Grade 2	Grade 3
Tensile strength, min, psi	50,000	60,000	66,000
Yield strength, min, psi	30,000	35,000	45,000
Bongation in 2 in.%	30	25	20

Grade and Chemical Composition

Grade	C≤	Mn	P≤	S≤	Si≥	Cr≤	Cu≤	Mo≤	Ni≤	V≤
A	0.25	0.27-0.93	0.035	0.035	0.10	0.40	0.40	0.15	0.40	0.08
B	0.30	0.29-1.06	0.035	0.035	0.10	0.40	0.40	0.15	0.40	0.08
C	0.35	0.29-1.06	0.035	0.035	0.10	0.40	0.40	0.15	0.40	0.08

 

Mechanical Properties:

Grade	RmMpa TensileStrength	Mpa YieldPoint	Elongation	DeliveryCondition
A	≥330	≥205	20	Annealed
B	≥415	≥240	20	Annealed
C	≥485	≥275	20	Annealed

 

Dimension Tolerances

PipeType	PipeSizes		Tolerances
ColdDrawn	OD	≤48.3mm	±0.40mm
		≥60.3mm	±1%mm
	WT		±12.5%

This standard refers to seamless and welded black and hot-dipped galvanized steel pipe. The steel categorized in this standard must be open-hearth, basic-oxygen or electric-furnace processed and must have the following chemical requirements: carbon, manganese, phosphorus, sulfur, copper, nickel, chromium, molybdenum, and vanadium. The tubing shall undergo a seamless or welding process. Tension, bend, and flattening tests shall be performed to make sure that it must adhere to the mechanical properties of the standard. The hydrostatic test shall be applied, without leakage through the weld seam or the pipe body. Nondestructive electric test shall be made to make sure that the full volume of the pipe must be in accordance with the standard. The purchaser shall have the right to perform any of the inspections and tests set forth in this specification where deemed necessary to ensure that the pipe conforms to the specified requirements.

ASTM A53 ERW Steel Pipe




 

 

ASTM A53 ERW Steel Pipe
Applications:	Mechanical and high-pressure applications, as well as for transporting steam, water and gas.
Size(mm):	O.D.: 21.3-610mm

 

Grade and Chemical Composition (%)

Grade	C ≤	M ≤	P ≤	S ≤	Cu ≥	Ni ≤	Cr ≤	Mo ≤	V ≤
A	0.25	0.95	0.05	0.045	0.40	0.40	0.40	0.15	0.08
B	0.30	1.20	0.05	0.045	0.40	0.40	0.40	0.15	0.08

 

Mechanical Properties:

Grade	Rm Mpa Tensile Strength	Mpa Yield Point	Elongation	Delivery Condition
A	≥330	≥205	20	Annealed
B	≥415	≥240	20	Annealed

As a result of the comprehensive performance of waterproof casing, it is widely used in chemical, construction, water supply and drainage, oil, light and heavy industries, freezing, sanitation, plumbing, fire, electricity and other infrastructure projects. But what are the measures to do with the use of waterproof casing in industrial buildings.

Subjected to damage in some chemical and electrochemical action caused some damage to the phenomenon. According to the pipeline corrosion parts, divided into corrosion of the inner wall and the outer wall, according to the corrosion morphology of the pipeline can be divided into general corrosion and local corrosion. According to the pipeline corrosion mechanism, can be divided into chemical corrosion and electrochemical corrosion. Coating is uniform and compact coating has metal pipe rust on the surface, the contact with all kinds of corrosive media, is one of the most basic methods of pipeline corrosion. Since the 70's, in the harsh environment of the polar, ocean and other harsh environments, as well as the installation of the pipeline, and the temperature rise, the temperature rise, the coating properties put forward more requirements. Therefore, the anticorrosion coating of the pipeline is more and more used in the composite material or composite structure.

Welded steel pipe since the invention, is applied more and more widely, welding steel pipe mainly includes: double-sided submerged arc welding longitudinal welded pipe, high frequency steel pipe, spiral pipe, they each have their own characteristics, in different fields play a different role. Longitudinal submerged arc welded pipe is steel plate into a tube opening of submerged arc welding using JCOE or UOE forming process, product quality and reliable, for petroleum and natural gas transmission, structural engineering, etc.. High frequency steel pipe is on the strip shape, made with the opening of the tube, high frequency welding, weld of the products more than higher than submerged arc welding steel pipe is much better. The products used for low pressure fluid transmission and architectural decoration column. Spiral steel pipe is the use of steel strip production of, its main features are available with a specification of the steel production of various caliber products and production welds is spiral, quality is buried arc welding pipe low for low-pressure fluid, decorative columns.

In recent years with the continuous development of steel pipe welding, the continuous improvement of production technology, the quality is constantly improving, such as seamless steel pipe out, it is the welded steel pipe hot rolled products, higher prices as a result of seamless steel pipe, in so many domains welded steel tubes instead of the application of seamless steel pipe.

Ordinary carbon structural steel by oxygen converter, open hearth furnace or electric furnace smelting, steel plate, steel strip, rolled into the general section and bar. Hot rolled steel general with (including rolling control) or normalizing treatment delivery. The chemical composition, tensile properties, impact work and cold bending properties of the steel should be in accordance with the relevant provisions.

In the Chinese national standard GB700-88, this kind of steel is divided into 5 grades according to the yield point, and is divided into 4 grades according to the quality. The grade is composed of 4 parts: the letter Q representing the yield point, the value of the yield point, the quality grade symbol and the method of the.

Ordinary carbon structural steel has a very wide range of applications, most of which are used for welding, riveting or bolted steel structures, a few for the production of a variety of machine parts. Low intensity of Q195, Q215 steel used for the production of low carbon steel wire, steel wire mesh, roof panel, welded steel pipe, anchor bolts and rivets. Q235 steel is of medium strength, and has good plasticity and toughness, and is easy to be formed and welded. This kind of steel is often used as reinforcement and steel structure, also used as rivets, a railroad spike and various mechanical parts, such as bolts, rod, connecting rod and so on. Q255, Q275 high strength steel for the production of agricultural machinery, but also can be used as reinforcement and railway fishplate.

According to requirements of some industrial use of the special properties of steel and ordinary carbon structural steel component minor adjustments to the formation of a series of professional steel, such as rivet and screw steel, steel bridge, pressure vessel steel, hull steel, boiler steel. Professional steel in addition to strict control of chemical composition, to ensure that the conventional performance, but also provides some special inspection projects, such as low temperature impact toughness, aging sensitivity, steel in gas, inclusion and fracture, etc..

API early in 1926 released by the American Petroleum Institute (API) API-5L standard, initially including three steel grade A25, A, B, and later released several times.

Prior to 2000, the worldwide use X70, about 40%, X65, X60 are in the 30%, a considerable number of small-caliber product oil pipeline selection of X52 steel grade, mostly for resistance welding straight pipe (ERW steel pipe).

China is currently used in the Petroleum Pipeline tube spiral welded pipe (SSAW), LSAW pipe (LSAW), electric resistance welded pipe (ERW). Diameter less than 152mm selection of seamless steel tubes. Of the late 1960s to the 1970s, spiral pipe plant rapid development of crude oil pipelines almost all spiral welded steel pipe, "West-East pipeline region selection spiral welded steel pipe. The spiral welded steel pipe of the disadvantage is the internal stress is large, the dimensional accuracy is poor, the probability of generation of defects. According to expert analysis, should adopt the policy of "walking on two legs", and actively carry out technological transformation now spiral welded pipe plant, also in promising; vigorously develop straight seam submerged arc control tube industry in China. ERW steel pipe with a smooth appearance, high dimensional accuracy, lower prices, and has been widely used at home and abroad.

Straight seam high frequency welded steel molding process is with advanced, reliable quality, welding position, stable welding parameters, welding speed, high yield, and the entire production line equipment and technology are world-class level.

(1) straight seam high frequency welded steel pipe forming process springback small residual stress.

(2) the strain hardening effect is small, precise geometric dimensions full circle, will help ensure the quality of construction and welding.

(3) straight seam high frequency welded steel bead shape is good, not prone to biting edge, inside and outside the weld misalignment defects.

(4) straight-seam pipe weld distributed in a point on the circumference and, therefore, according to the demand to weld on a favorable position.

API 5L welded steel pipe is mainly used for the delivery of the onshore and offshore oil and gas, coal slurry, the slurry media and offshore platforms, power plants, chemical industry and urban construction, structural tubes.