Detailed Product Description
Application & Compliance
ASTM A312 TP316, TP316L, and 253MA seamless stainless steel pipes are specified for shell and tube heat exchangers, heat exchanger tubesheets, and high-temperature process piping where both corrosion resistance and elevated-temperature strength are required. In chemical processing heat exchangers, the molybdenum-bearing TP316/316L grades resist chloride pitting and crevice corrosion from cooling water and process chemicals, protecting the tube-side fluid from contamination and the shell-side medium from corrosion product ingress.
The pipes are manufactured and tested in accordance with ASTM A312 / ASME SA312, the standard specification for seamless, welded, and heavily cold-worked austenitic stainless steel pipe for high-temperature and general corrosion service. Certification is available per EN 10204 Type 3.1 or 3.2. Third-party inspection by ABS, GL, DNV, NK, PED, AD2000, and CCS is available upon request.
Problem Solved
Standard TP304/304L grades suffer pitting and crevice corrosion in chloride-bearing cooling water and process streams, leading to tube wall penetration and cross-contamination in heat exchangers. TP316/316L solves this by adding 2.00–3.00% molybdenum, which significantly raises the pitting resistance equivalent number and extends service life in marine, chemical, and pharmaceutical environments.
Material Specification – ASTM A312 TP316 / TP316L
ASTM A312 covers austenitic stainless steel pipe intended for high-temperature and general corrosion service. TP316 and TP316L are molybdenum-bearing grades based on the 18Cr-8Ni family. TP316L is the low-carbon version, preferred for welded fabrication where carbide precipitation must be minimized.
Chemical Composition (per ASTM A312 for TP316 / TP316L)
| Element | TP316 (%) | TP316L (%) |
|---|
| Carbon (C) | 0.08 max | 0.035 max |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Silicon (Si) | 1.00 max | 1.00 max |
| Chromium (Cr) | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.00 – 3.00 | 2.00 – 3.00 |
Mechanical Properties (per ASTM A312 for TP316 / TP316L)
| Property | TP316 (min) | TP316L (min) |
|---|
| Tensile Strength | 515 MPa (75 ksi) | 485 MPa (70 ksi) |
| Yield Strength (0.2% offset) | 205 MPa (30 ksi) | 170 MPa (25 ksi) |
| Elongation in 50 mm | 35% | 35% |
| Hardness (HBW) | 217 max | 192 max |
Material Specification – ASTM A312 UNS S30815 / 253MA
253MA (UNS S30815, EN 1.4835) is an austenitic stainless steel alloyed with nitrogen and rare earth metals (cerium). The grade is characterized by high-temperature oxidation resistance, creep strength, and resistance to sigma phase precipitation. It is designed to withstand service temperatures up to approximately 1100°C.
Chemical Composition (per ASTM A312 for UNS S30815)
| Element | Requirement (%) |
|---|
| Carbon (C) | 0.05 – 0.10 |
| Silicon (Si) | 1.4 – 2.0 |
| Manganese (Mn) | 0.80 max |
| Phosphorus (P) | 0.030 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 20.0 – 22.0 |
| Nickel (Ni) | 10.0 – 12.0 |
| Nitrogen (N) | 0.14 – 0.20 |
| Cerium (Ce) | Rare earth addition |
Mechanical Properties (per ASTM A312 for UNS S30815)
| Property | Requirement (min) |
|---|
| Tensile Strength | 600 MPa |
| Yield Strength (0.2% offset) | 310 MPa |
| Elongation in 50 mm | 40% |
| Hardness (HRB) | 95 max |
| Hardness (HBW) | 217 max |
Heat Treatment
All grades are supplied in the solution-annealed condition followed by rapid cooling to restore corrosion resistance and dissolve carbides. TP316 and TP316L are typically solution annealed at a minimum of 1040°C. 253MA requires solution annealing at a higher temperature range to develop its designed microstructure and properties. The pickled surface condition removes oxide scale and provides a clean, corrosion-resistant finish suitable for heat exchanger and piping service.
Manufacturing Process
Seamless pipe is produced from stainless steel billets through piercing, hot rolling or extrusion, and cold drawing or cold rolling to final dimensions. After the final forming operation, the pipe is solution annealed in a controlled-atmosphere furnace, rapidly cooled, pickled to remove surface scale, straightened, and cut to length. Dimensional inspection, chemical analysis, and mechanical testing are performed on each lot before shipment. Tubes can be supplied in straight lengths or U-bend form for heat exchanger bundle assembly.
Size Range
Outside diameter ranges from 1/2″ to 48″. Wall thickness covers SCH 5S through SCH XXS. Lengths are available as single random, double random, or cut-to-length per customer requirement. End preparation includes plain ends or beveled ends.
Testing and Quality Control
Each lot is subjected to chemical composition analysis, tensile testing, yield strength verification, elongation measurement, and hardness testing. Non-destructive examination includes Eddy Current Testing (ET), Ultrasonic Testing (UT), and hydrostatic testing as specified. Positive Material Identification (PMI) is performed to confirm alloy grade. Dimensional inspection verifies outside diameter, wall thickness, length, and straightness. Full material traceability is maintained to mill certificates.
Documentation
Each shipment is supplied with Mill Test Certificates (EN 10204 Type 3.1 or 3.2), heat treatment records, hydrostatic test reports, NDE reports (ET/UT as applicable), dimensional inspection reports, and material traceability records.
For a rapid quotation on ASTM A312 TP316 316L 253MA Seamless Stainless Steel Pipe, please provide the following information:
Quantity (number of pieces or weight)
Material grade (TP316, TP316L, or UNS S30815 / 253MA)
Outside diameter and wall thickness
Length required (fixed length or random length)
Tube shape (straight or U-bend)
Surface finish requirement (Pickled and Annealed or Bright Annealed)
End preparation (plain ends or beveled ends)
Delivery period required
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