304L Stainless Steel Tube
1. Standard: ASTM A213/ASME SA213、ASTM A269/ASME SA269
2. Seamless: 3.35 mm OD To 101.6 mm OD
3. Welded: 6.35 mm OD To 152 mm OD
4. Schedules: Sch 5 - XXS
5. Grades：Alloy 304L, UNS S30403, WNR.1.4306, 1.4307
304L stainless steel tube is an alloy pipe containing 18% chromium, 8% nickel and low carbon content. SS 304L tube has good resistance to intergranular corrosion. It has excellent general corrosion resistance and can be used as heat-resistant stainless steel. At the same time, 304L pipe still has good mechanical properties at -180℃. The plasticity, toughness and cold working properties of 304L tubing in the solid solution state make it corrosion-resistant in oxidizing acids, atmosphere, water and other media.
ASTM A213 UNS S30403 stainless steel tube standard：
- ASTM A213 : Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
- ASTM A269 : Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service
- ASTM B676 : Specification for UNS N08367 Welded Tube
TP304L Stainless Steel Tube Specifications
| Standards | ASTM A213, ASTM A269, ASME SA213, ASME SA269 |
|---|---|
| Seamless Tube Size | 3.35 mm OD To 101.6 mm OD |
| Welded Tube Size | 6.35 mm OD To 152 mm OD |
| Swg & Bwg | 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg. |
| Schedule | SCH5, SCH10, SCH10S, SCH20, SCH30, SCH40, SCH40S, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| WT | 0.020" –0.220", (special wall thicknesses available) |
| Length | Single Random, Double Random, Standard & Cut length |
| Finish | Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF |
| Form | Straight, Coiled, Seamless, Round Pipes/ Tubes, Square Pipes/ Tubes, Rectangular Pipe/ Tubes, Coiled Tubes, "U" Shape, Pan Cake Coils, Hydraulic Tubes, Straight or 'U' bent Tubes, Hollow, LSAW Tubes Etc. |
| Type | Seamless, ERW, EFW, Welded, Fabricated |
304L Tubing Dimensional Tolerances
|
OD |
OD Tolerance |
Wall Tolerance |
|
≤ .500" |
± .005" |
± 10% |
|
.500"–1.500" excl |
± .005" |
± 10% |
|
1.500"–3.500" excl |
± .010" |
± 10% |
|
3.500"–5.500" excl |
± .015" |
± 10% |
Chemical Composition of ASME SA213 UNS S30403 Tubes
|
UNS |
C Carbon |
Mn |
P |
S |
Si |
Cr |
Ni Nickel |
|
S30403 |
0.030 max |
2.00 max |
0.045 max |
0.030 max |
1.00 max |
18.0–20.0 |
8.0–13.0 |
Stainless Steel WERKSTOFF NR. 1.4306 Tubing Mechanical Properties
| Temper | 304L | |
|---|---|---|
| Tensile Rm | 70 | ksi (min) |
| Tensile Rm | 485 | MPa (min) |
| R.p. 0.2% Yield | 25 | ksi (min) |
| R.p. 0.2% Yield | 170 | MPa (min) |
| Elongation (2" or 4D gl) | 40 | % (min) |
304L Stainless Steel Tube Physical Properties (Room Temperature)
| Specific Heat (0-100°C) | 500 | J.kg-1.°K-1 |
| Thermal Conductivity | 16.2 | W.m -1.°K-1 |
| Thermal Expansion | 17.2 | μm/μm/°C |
| Modulus Elasticity | 19.3 | GPa |
| Electrical Resistivity | 7.23 | μohm/cm |
| Density | 8.0 | g/cm3 |
SUS 304L Steel Tube Application
- General chemical equipment, atomic energy industry parts, etc.
- Deep-drawn infusion tubes, containers, etc.
- Automobiles, automobile parts boxes and other household appliances
- Thin-walled parts, acid-resistant pipes and structural parts.
- Welding chromium-nickel stainless steel and stainless steel core materials
- Non-magnetic parts used in low temperature environments
SS 304L Tubing Fabrication
Alloy 304L Weldability
ASTM A213 UNS S30400 pipe has excellent weldability and machinability, and can be subjected to various mechanical processing and precision manufacturing as needed. AISI 304L can be welded by ordinary methods because its maximum carbon content is 0.035%, which can inhibit the precipitation of carbides and has good welding performance. For manual arc welding, for 304 stainless steel with thinner cross-sectional dimensions, austenitic 002 welding rods can be used, which will not produce intergranular corrosion tendency.
SS 304L Pipe Heat Treatment Process
Solution treatment temperature of DIN 1.4301 stainless steel is 1080-1100℃, water cooling or air cooling. The intermediate annealing temperature of cold working is 850-970℃, and water cooling is performed after a certain period of stay. The steel structure after solution treatment is austenite, and sometimes contains a small amount of ferrite.
304L Steel Cold Forming Performance
Cold forming performance of SA 213 TP 304l tube is an important technical indicator to measure whether the forming is smooth and the yield rate. In order to obtain good cold forming performance, the manufacturer must control the ratio of chromium equivalent to nickel equivalent in the steel within an appropriate range.
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