Stainless Steel Welded Pipe

on June 06, 2019

Our staff are qualified and certified according to all current welding procedures, thus guaranteeing our customers longitudinally welded stainless steel pipes in line with the requirements.

Large size SS 304 stainless pipe

stainless steel welded pipe for food hygiene

A wide range of effective production facilities offers you a large number of possibilities:

Corrosion resistant pipes with outer diameters from 15 to 2 032 mm (80 inch) and wall thicknesses up to 70 mm
Pipes are made from special alloys, titanium or clad materials
Pipes with demanding tolerance requirements
Pipes in special geometric shapes
Pipes according to internationally valid standards, including DIN, DIN EN, DIN EN ISO, NORSOK, API and ASTM

Large size SS 304 stainless pipe

The general features of our DSSP: superior corrision resistance, such as pitting corrosion, crevice corrosion, abrasion corrosion; better weldability and mechanical properties; excellent intergranular corrosion resistance and better cost- effectiveness.

Stainless steel can withstand corrosive or chemical environments due to its smooth surface.

NPS: 1/8" through 24"
Schedules: 5, 10, 10S, 20, 30, 40, 40S, 80, 80S
Specifications: ASTM A312, ASME SA312

Material stainless steel grades

Also known as "marine grade" stainless steel due to its increased ability to resist saltwater corrosion compared to type 304. SS316 is often used for building nuclear reprocessing plants.

304/304L Stainless Steel

304 Stainless is a low carbon (0.08% max) version of basic 18-8 also known as 302. Type 302 has 18% chromium and 8% nickel.

316/316L Stainless Steel

Type 316/316L Stainless Steel is a molybdenum steel possessing improved resistance to pitting by solutions containing chlorides and other halides.

310S Stainless Steel

310S Stainless Steel has excellent resistance to oxidation under constant temperatures to 2000°F.

317L Stainless Steel

317L is a molybdenum bearing austenitic chromium nickel steel similar to type 316, except the alloy content in 317L is somewhat higher.

321/321H Stainless Steel

Type 321 is basic type 304 modified by adding titanium in an amount at least 5 times the carbon plus nitrogen contents.

410 Stainless Steel

Type 410 is a martensitic stainless steel which is magnetic, resists corrosion in mild environents and has fairly good ductility.

Duplex 2205 (UNS S31803)

Duplex 2205 (UNS S31803), or Avesta Sheffield 2205 is a ferritic-austenitic stainless steel.

Duplex 2507 (UNS S32750)

Duplex 2507 (UNS S32750) is a super duplex stainless steel with 25% chromium, 4% molybdenum..

DUPLEX UNS S32760

UNS S32760 is described as a super duplex stainless with a microstructure of 50:50 austenite and ferrite.

SA 269

ASTM A269 / A269M Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

SA 249 Stainless Steel

ASME SA 249 Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes.

904L Stainless steel

904L stainless steel consists of chromium, nickel, molybdenum and copper contents, these elements give type 904L stainless steel excellent properties

Product Specification and Size

Stainless Steel Seamless Tubes is a hollow steel bar, a large number of pipes used for conveying fluids, such as oil, gas, water, gas, steam,heat exchanger,mechinical machine. In addition, engaging in bending, torsional strength of the same, lighter, and they are also widely used in the manufacture of mechanical parts and engineering structures.

Available Specification

Product Name	Executive	Dimension	Steel Code / Steel Grade
Industrial Pipes	ASTM A312, A358, A778 JIS G3459	OD: 1/4"-40" WT: SCH5S-SCH80S	TP304, TP304L, TP316L SUS304TP
Tubes for Boiler and Heat-Exchanger, General Service Tubing	ASTM A249, A269 JIS G3463	OD: 15.9-139.8mm WT: 1.6-5.0mm	TP304, TP304L, TP316L SUS304TB
Mechanical and Structural Tubes	ASTM A554 JIS G3446	OD: 7.9-152.4mm WT: 0.5-6.5mm	MT304, MT304L, MT316L, MT430 Grade 201, 202 as per mill's STD SUS304
Square Tubes	ASTM A554	OD: 12.7x12.7-150x150mm WT: 0.7-6.5mm	MT304, MT304L, MT316L,MT430 Grade 201, 202 as per mill's STD
Rectangular Tubes	ASTM A554	OD: 10x20-100x200mm WT: 0.7-6.5mm	MT304, MT304L, MT316L,MT430 Grade 201, 202 as per mill's STD
Sanitary Tubing	ASTM A270 JIS G3447	OD: 25.4-165.2mm WT: 0.8-3.05mm	TP304, TP304L, TP316L SUS304TBS
Large Gauge Pipes for Ordinary Piping	JIS G3448	OD: 15.88-318.5mm WT: 0.8-3.0mm	SUS304TPD
Large Diameter Pipes	JIS G3468	OD: 14"-40" WT: SCH5S-SCH40S	SUS304TPY

Chemical Composition & Mechanical Property

Chemical Composition (For Reference)

Steel Grade	C% Max.	Si% Max.	Mn% Max.	P% Max.	S% Max.	Cr% Max.	Ni% Max.	Mo% Max.	Ti% Max.	Other
SUS 201	0.15	1.0	5.5-7.5	0.06	0.03	16.0-18.0	3.5-5.5	-	-	N:0.25
SUS 202	0.15	1.0	7.5-10.0	0.06	0.03	17.0-19.0	4.0-6.0	-	-	N:0.25
SUS 304	0.08	1.0	2.0	0.045	0.03	18.0-20.0	8.0-10.5	-	-	-
SUS 304L	0.03	1.0	2.0	0.045	0.03	18.0-20.0	9.0-13.0	-	-	Cu:1.0-3.0
SUS 316L	0.03	1.0	2.0	0.045	0.03	16.0-18.0	12.0-15.0	2.0-3.0	-	-
SUS 430	0.12	0.75	1.0	0.04	0.03	16.0-18.0	-	-	-	-

Mechanical Property (For Reference)

Steel Grade	N/mm ₂ MIN. Tensile Stress	N/mm ₂ MIN. Proof Stress	Elongation MIN.	HRB MAX. Hardness	Bendability:Bending Angle	Bendability:Inside Radius
SUS 201	520	275	40	100	No Require	-
SUS 202	520	275	40	95	No Require	-
SUS 304	520	205	40	90	No Require	-
SUS 304L	480	175	40	90	No Require	-
SUS 316L	480	175	40	90	No Require	-
SUS 430	450	205	22	88	180°	1.0 time the thickness

the main requirement for stainless steels is that they should be corrosion resistant for a specified application or environment. The selection of a particular "type" and "grade" of stainless steel must initially meet the corrosion resistance requirements.

Welded Tube Standard Specifications

Specifications	Tube Pipe Type	Material	Applications
ASTM A249	Welded	Austenitic Steel	Boiler, Superheater, Heat Exchanger, And Condenser
ASTM A268	Seamless And Welded	Ferritic And Martensitic Stainless Steel	General Service
ASTM A269	Seamless And Welded	Austenitic Stainless Steel	General Service
ASTM A270	Seamless And Welded	Austenitic And Ferritic / Austenitic Stainless Steel	Sanitary Tubing
ASTM A312	Seamless, Welded, And Heavily Cold Worked	Austenitic Stainless Steel	High-Temperature And General Corrosive Service
ASTM A358	Welded	Austenitic Chromium-Nickel Stainless Steel	High-Temperature Service And General Applications
ASTM A554	Welded	Stainless Steel	Mechanical Tubing
ASTM A688	Seamless And Welded	Austenitic Stainless Steel	Feedwater Heater
ASTM A789	Seamless And Welded	Ferritic/Austenitic Stainless Steel	General Service
ASTM A790	Seamless And Welded	Ferritic/Austenitic Stainless Steel	General Service
EN 10217-7	Welded	Stainless Steel	Pressure And Corrosion Purpose
EN 10312	Welded	Stainless Steel	Water And Other Liquids

Additional mechanical or physical properties may also need to be considered to achieve the overall service performance requirements.

Welding Methods:

Welded stainless steel tube is made from long strip or sheet, passed a rolling machine, then the strip edges is welded longitudinally and melt together, using various welding processes, making welding beam is as same as base metal, and form into tube shape.

The sheet width is desired tube outside diameter, the width should be calculated before manufacturing.

TIG

Tungsten Inert Gas welding, another name for Gas tungsten arc welding (GTAW), is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area and electrode is protected from oxidation or other atmospheric contamination by an inert shielding gas.

EFW

Electric Fusion Welding, Electric Fusion Welding (EFW steel pipe) refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the workpiece so that the workpiece leaving the melt, the formation of the weld. It is mainly used for welding dissimilar steel welding sheet or which high power density, metal weldment can rapidly heated to high temperatures, which can melt any refractory metals and alloys.

ERW

Electric Resistance Welding, high-frequency electrical current is passed between the material edges, then the edges are forced together under pressure as a butt joint and then welded by heating the material to high temperatures.

DSAW

Double Submerged arc welded, similar to other pipe manufacturing processes, the manufacture of Double Submerged Arc Welded Pipe involves first forming steel plates into cylindrical shapes. The edges of the rolled plate are formed so that V-shaped grooves are formed on the interior and exterior surfaces at the location of the seam. The pipe seam is then welded by a single pass of an arc welder on the interior and exterior surfaces.

LSAW

Longitudinal Submerge-arc Welded, LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.

HFW

High Frequency Welding, HFW welded steel pipes are widely preferred in Oil, Natural Gas, Water and other liquids transportation and distribution lines, heating, cooling, ventilation piping and steel structures for construction and other general purposes by means of precise production tolerances and high capacity manufacturing method.

Heat treatment is generally required after manufacture, this process improves stainless steel welded tube properties, help welded tube suitable for wide applications.

Welded Tubes Quality Control:

All stages from raw material to finished products, tube manufactured under strict quality control, making sure tube having stable mechanical properties, excellent surface finish and high dimensional accuracy.

Standard Testing

Tensile Strength test
Flattening test
Flare test
Flange test
Dimensional inspection
PMI
Hardness test
Eddy Current test

Optional Testing

Ultrasonic test
Hydrostatic test
Air Under Water test
Grain Size
Corrosion test
Metallographic
Radiographic test.

Welded Tube VS Seamless Tube:

There are differences between welded tube and seamless in manufacturing, typical appearance is that welded have welding seam, without or with additional filler metal, but seamless tube have not.

Size Range

Welded tube can be produced in a wide range sizes and dimensions, both large diameter and small diameter, it is hard to produce very large size and very thin wall seamless tube.

Production Time

Welded tube have short production time, because it posses more simple manufacturing process, in most condition, for seamless tube, several producing processes are needed to duplicate, such as cold rolling, heat treatment.

Working Pressures

Working pressures of the welded tube are approximately 20% less than the seamless tube, seamless tube is better selection use in harsh environment.

Production Cost

Obviously, welded tube is effective cost choice for many applications, seamless tube have higher price, but it is also durable.

Tolerance

Welded tubes have excellent concentricity, tight tolerance in outside diameter and wall thickness.

Inspection & Quality Control:

With a complete set of advanced testing equipment, we have the following Regular Testing Items:

Chemical Composition Analyzing;
Metallographic Test ;
Mechanical Properties Test;
Hydraulic Test;
Non-destructive Test, including X-Ray Flaw Detection;
Dimensional Checking;

Flattening
Flare & Flange
Reverse Bend
Reverse Flattening
Tensile Strength
Hardness

Enquiry/Ordering Information :

Material Grade
NB Pipe Size or Outside Diameter
Wall Thickness, Length - Random/Standard/Specific

Finish Required
Relevant Specification
Application/End use

Finishes :

As welded
Welded & externally polished
Welded Annealed & Pickled

Welded Cold Drawn Annealed & Pickled
Welded Cold Drawn Annealed Pickled & externally polished
Other Finishes as per customers requirement

Also used in producing all kinds of conventional weapons, the barrel, artillery shells and so on.

Custom Grades of Stainless Steel Tube

Austenitic: 201, 304/304L, 316/316L, 317/317L, 347/347H, 321/321H, 904L
Ferritic: 409, 430, 439, 441, 434, 436, 444, 446
Martensitic: 403, 410, 410S, 414/L, 441, 418, 420, 440, 416
Duplex: 2205/S31803, S32750, S32760

Common Applications for Stainless Steel Tubing Stainless steel tubing has a number of uses in a wide variety of industries. It can be used during manufacturing in processing plants or can become part of a final product. Stainless steel tubing can also be used in pipelines to transport oil, gas, water, or chemicals.

Range of application

Stainless steel pipe (tube) has excellent characteristics of corrosion resistance and smooth finishing. Stainless steel pipe (tube) is commonly used in demanding equipment like automobiles, food processing, water treatment facilities, oil and gas processing, refinery and petrochemicals, breweries and energy industries.

The stainless steel tubing that is supplied by SunnySteel can used in a variety of industries, including:

Machinery Parts
Pharmaceutical
Biotechnology
Automotive
Oil and Gas
Marine

Food and Beverage Processing
Construction
Automotive industries
Food processing
Water treatment facilities
Breweries and energy industries

The main requirement for stainless steels is that they should be corrosion resistant for a specified application or environment. The selection of a particular "type" and "grade" of stainless steel must initially meet the corrosion resistance requirements.

Additional mechanical or physical properties may also need to be considered to achieve the overall service performance requirements.

Tech & Grade for Stainless steel:

Stainless steel is one of the more standardized materials in the building and engineering industries.