Pickled & Annealed Stainless Steel Seamless Pipe ASTM A312 TP316L SCH40 Corrosion-Resistant Tube
Pickled & Annealed Stainless Steel Seamless Pipe ASTM A312 TP316L SCH40 Corrosion-Resistant Tube
1.Product Description
This product catalog provides a selection database for stainless steel seamless pipes used in pressure piping systems, designed in accordance with major international design codes (ASME B31.3, EN 13480, GB/T 20801). It covers five major material categories: austenitic (304/316 series), stabilized (321/347), heat-resistant (304H/347H), duplex (2205/2507), and super-austenitic (904L/254SMO). Each material is accompanied by essential engineering design parameters, including temperature-pressure ratings, allowable stresses, coefficients of thermal expansion, and thermal conductivity. This document is intended to assist design institutes, engineering companies, and end-users in completing material selection and preliminary wall thickness calculations at the project front-end, thereby improving design efficiency and controlling procurement costs.
2. Product Applications
| Service Condition | Recommended Grades (Priority Order) | Key Selection Basis |
| Ambient temp/pressure, non-corrosive water/gas | 304 → 304L → 316 | Lowest cost; 304L offers better sensitization resistance |
| Moderate corrosion (dilute acids, weak alkalis, ≤60℃) | 316L → 316 → 304L | Molybdenum enhances pitting resistance |
| High-temp steam/boilers (≤650℃) | 347H → 304H → 321 | Stabilized + fine grain for creep resistance |
| Chloride/seawater service (ambient) | 2205 → 2507 → 904L | Duplex best resists Cl⁻ stress corrosion cracking |
| Strong oxidizing acids (hot concentrated H₂SO₄) | 254SMO → 904L → 316L | High Ni/Mo for general corrosion resistance |
| Cryogenic (LNG, -162℃) | 304L → 316L | Austenitic retains excellent toughness, no brittle transition |
| High-purity/clean media (pharma, electronics) | 316L (EP grade) → 304L (BA grade) | Extremely low internal surface roughness required |
3. Product Advantages
-
Life-Cycle Cost (LCC) advantage: Although the initial purchase price of seamless pipes is higher than that of welded pipes of the same specification, the elimination of weld-related corrosion and fatigue failure risks reduces maintenance frequency by 50%~70% under high-temperature, high-pressure, and corrosive services. The total 20-year cost (procurement + installation + operation & maintenance + downtime losses) is generally lower than that of welded pipes. See comparison table below:
Comparison Item Seamless Pipe Welded Pipe (same grade) Initial purchase price Base +20%~40% Base Number of field welds Fewer (longer tube lengths) More (length-limited) Inspection/maintenance interval 8~10 years 3~5 years 20-year total cost Lower Higher (due to frequent replacement) -
Wall thickness reduction potential: As seamless pipes have no weld joint coefficient penalty (weld joint coefficient E=1.0), the required wall thickness calculated per ASME B31.3 can be reduced by approximately 10%~15% compared to welded pipes (E=0.85). This directly lowers material weight and procurement costs while reducing pipe support loads.
-
Supply chain flexibility: Non-standard OD and WT combinations (e.g., special schedules beyond ANSI) are available to match existing fittings in revamp projects, with delivery times shortened to 4~6 weeks (2 weeks for standard stocked sizes).
-
Digital selection tool support: An Excel-based allowable stress lookup table and automatic wall thickness calculation template can be provided with the shipment, enabling quick strength verifications and reducing manual chart-reading errors.
-
Broad stocking range: Regular inventory covers DN15~DN600 across all schedules (SCH10S to SCH160), meeting over 90% of common engineering demands, with emergency shipments possible within 24 hours.
4.Key Product Parameters
| Parameter | 304/L | 316/L | 321 | 347H | 2205 | 904L |
| Maximum continuous service temp (℃) | 425 | 425 | 650 | 750 | 300 | 400 |
| Allowable stress @100℃ (MPa) | 115 | 115 | 120 | 135 | 190 | 110 |
| Allowable stress @400℃ (MPa) | 85 | 85 | 90 | 105 | — | — |
| Coeff. of expansion (20~400℃)×10⁻⁶/℃ | 17.2 | 17.5 | 17.0 | 17.8 | 13.5 | 15.5 |
| Thermal conductivity @100℃ W/(m·K) | 16.2 | 16.3 | 16.1 | 16.5 | 19.0 | 13.0 |
| Critical Pitting Temperature (CPT, ℃, in 6%FeCl₃) | ＜10 | 20 | 15 | 20 | 45 | 65 |
| SCC resistance (in Cl⁻ environments) | Poor | Medium | Medium | Medium | Excellent | Good |
| Common wall thickness schedules | SCH10S~SCH160, with non-standard options available | |||||
| Minimum cold bending radius | 3.5×OD (hot bending or sand-filled cold bending recommended) | |||||
| Recommended filler metal | ER308(L) | ER316(L) | ER321 | ER347 | ER2209 | ER385 |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.