DONGSHANG Stainless produces A213 TP316L seamless stainless steel tube for heat exchanger, boiler, super heater equipment, heat treatment and pickling finishing, tube furnished to ASTM A213 shall conform to the requirements of Specification A1016 / A1016M, grades cover Ferritic and Austenitic stainless steels.
We have capacities to offer MW and AW wall thickness seamless tubes to meet specific applications, bright annealed and annealing pickling finishes are available, and we also offer U bend tubes and coiled tubes for heat exchanger systems.
A213 316L Stainless Steel
316L is low carbon 316, with carbon content not exceeding 0.035%, and Molybdenum content of 2.0 – 3.0%, so TP316L has excellent corrosion resistance to applied many high acid environments, in Europe, it is 1.4404, a little difference between TP316L and 1.4404 in chemical composition and mechanical property, see more.
ASTM A213 316L Stainless Steel Chemical Composition
| C | Mn | P | S | Si | Ni | Cr | Mo | N | |
|---|---|---|---|---|---|---|---|---|---|
| 316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.0 | 10-14 | 16-18 | 2-3 | |
| 1.4404 | 0.03 | 2.00 | 0.040 | 0.015 | 1.0 | 10-13 | 16.5-18.5 | 2-2.5 | 0.11 |
ASTM A213 316L Stainless Steel Mechanical Properties
| Tensile Strength(Mpa) | Yield Point(Mpa) | Elongation(%) | Elongation(%) | |
|---|---|---|---|---|
| 316L | 485 | 170 | 35 | 25 |
| 1.4404 | 490-690 | 190 | 40 | 30 |
316L Stainless Steel Features
316L Stainless Steel grade is molybdenum-bearing austenitic stainless steel, 316L is more resistant to general corrosion and pitting corrosion, crevice corrosion than conventional chromium-nickel austenitic stainless steel such as 304.
316L Stainless Steel also offers higher creep, stress-to-rupture, and tensile strength at elevated temperatures. The recommended temperature range includes -425°F to 1,200°F (-255°C to 605°C).
In addition to excellent corrosion resistance and strength properties, the Alloys 316 and 316L Cr-Ni-Mo alloys also provide excellent fabricability and formability which are typical of austenitic stainless steel, 316l is often used in marine atmosphere.
Manufacturing A213 316L Seamless Stainless Steel Tube
Cold Rolled/Drawn
DONGSHANG Stainless hold sets of advanced cold rolling machines, sizes range from 6 mm – 610 mm, we choose billets from China best suppliers for seamless stainless steel tube material, after analysis billets, and ensure high quality, cold rolling process aim to reduce outside diameter and wall thickness to tube normal standard size.
Heat treatment
Heat treatment is a important process in producing seamless tube, Ferritic and Austimetic stainless steel grades in different annealing temperature, generally, 1040 1150C, all the tubes should be annealed complying with A213 specification, uniform grain structure, and maximum corrosion resistance, expanding tubes life in harsh environment.
Pickling
Pickling is the removal of any high temperature scale and any adjacent low chromium layer of metal from the surface of stainless steel by mixture of nitric and hydrofluoric acids, making tube outer and inner surface clean and smooth, lower roughness value, but notice dwell time in pickling tank as per different stainless steel grades.
ASTM A213 Stainless Steel Tubes Outside Diameter and Wall Thickness Tolerance
| OD, MM | OD TOLERANCE |
|---|---|
| < 25.4 | +/- 0.10 |
| 25.4 – <= 38.1 | +/- 0.15 |
| > 38.1 -< 50.8 | +/- 0.20 |
| 50.8 -< 63.5 | +/- 0.25 |
| 63.5 -< 76.2 | +/- 0.30 |
| 76.2 – <= 101.6 | +/- 0.38 |
| > 101.6 – <= 190.5 | +0.38/-0.64 |
| > 190.5 – <= 228.6 | +0.38/-1.14 |
| OD, MM | WT TOLERANCE |
|---|---|
| <= 38.1 | +20%/-0 |
| > 38.1 | +22%/-0 |
Tests
Flattening Test
One flattening test shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot.
Flaring Test
Flaring Test—One flaring test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot.
Hydrostatic or Nondestructive Electric Test
Each tube shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used shall be at the option of the manufacturer unless otherwise specified in the purchase order.