ASTM A249 TP304 Stainless Steel Tubes

ASTM A249 TP304 stainless steel tubes is always required for pressure system, we have many year experience to produce TIG welded tubes, that is the most used method for ASTM A249 tubes.

ASTM A249 welded stainless steel tube has good properties for boiler, super heater, heat exchanger and condenser, particular it provides good corrosion resistance and high strength。

ASTM A249 TP304 Stainless Steel Tube Specifications

StandardASTM A249
MaterialTP304
Tube TypeWelded tube
FinishesAnnealing pickling, bright Annealing
Outside Diameter6 up to 304.8 mm
Thickness0.5 up to 6 mm
ApplicationHeat exchanger system

ASTM A249 TP304 Stainless Steel

ASTM A249 covers austenitic stainless steel tubes, with various grades, TP304 stainless steel is the most used grade, the equivalent is ASME SA249 TP304.

ASTM A249 TP304 Chemical Composition

GradeCSiMnCrNiSPFe
TP3040,081,0218 – 208 – 110,030,045Bal.

ASTM A249 TP304 Mechanical Properties

GradeTensile Strength (Mpa)Yield Point (Mpa)Elongation (%)
TP30451520535

ASTM A249 Stainless Steel Tube Manufacturing

ASTM A249 specification covers nominal wall thickness and heavily cold worked welded tube, it is a common standard to specify welded tube for heat exchanger, it requires a manufacturing process and a quality system。

Strip

Quality welded tube starts from quality strip, it requires fine edge condition and uniform wall, our material is offered by the best suppliers.

welded stainless steel tube mould

TIG Welding

We use tungsten inert gas (TIG) welding method, it is automatic to weld two edges of strip and form tubular shape, this process must achieve precise joint between bead and base metal.

TIG stainless steel tube

Related: TIG Welding Stainless Steel Tube

Cold Working

After welding, inside and outside of tube most be forged to achieve high integrity, then have a correct properties, and also possess precise dimensions.

Heat Treatment

Annealing is a very important process, tubes are heated to required solution temperature and rapidly cooling, ASTM A249 TP304 stainless steel requires minimum solution temperature is 1040 degree, it can restabilize microstructure to ensure premium properties。

Bright Annealing Option

澳门凯发娱乐Bright annealing welded tube is often required, tube pass through in closed furnace, inserting hydrogen gas to isolate surrounding atmosphere, finally forming a passive oxide film on the surface。

Related: Bright Annealing Tubing

ASTM A249 TP304 Stainless Steel Tubes Sizes

We offer a large sizes and dimensions for heat exchanger tubes, common sizes are provided below, and others are available.

Outside Diameter12.7, 15.88, 19.05, 25.4, 31.8, 38.1, 45, 50.8, 60.3, 76.2 mm
Wall Thickness0.51, 0.71, 0.89, 1.0, 1.25, 1.65, 2.11, 2.77, 3.05 mm.

Quality Control System

Tube analysis shall conform to the requirements as to chemical composition specified on ASTM A249 TP304 grade, usually we use PMI method to identify the material.

Nondestructive Testing

In practice, eddy current tests perform well in the most case, to detect tube imperfection。 Each tube is inspected by ECT。

Dimensional Inspection

All the tubes should be meet to requirements of ASTM A249 specification, including tolerance of the tube outside diameter (OD), wall thickness, and length, minimum wall thickness tube is available。

OD WTH L
<25.40 mm ±0.10 mm ±10.00% OD<50.8 mm +3.0 mm -0 mm
OD≥50.8 mm +5.0 -0 mm
≥25.4 ~ 38.1 mm ±0.15 mm
≥38.1 ~ 50.8 mm ±0.20 mm
≥50.8 ~ 63.5mm ±0.25 mm
≥63.5 ~ 76.2 mm ±0.30 mm
≥76.2 ~ 101.6 mm ±0.38 mm
≥101.6 ~ 190.5 mm +0.38 -0.64 mm
≥190.5 ~228.6 mm +0.38 -1.14 mm

Mechanical Tests

There are destructive tests are performed on tube samples these tests have tests flattening test, flange test, and reverse bend test。

stainless steel welded tube property testing

Hardness Test

ASTM A249 TP304 requires hardness in Rockwell B90 maximum。

Corrosion Testing

ASTM A249 specification requires corrosion testing in SUPPLEMENTARY REQUIREMENTS, purchaser should indicate the test when it is needed, intergranular corrosion and weld decay tests are considered widely to be a reliable corrosion test。

ASTM A249 TP304 Stainless Steel Tubes