01 / PRODUCT OVERVIEW & KEY PARAMETERS
| Item / Parameter | Specification |
| Product Name | Stainless Steel Pipe & Tube (Seamless & Welded) |
| Manufacturing Types | Cold Drawn Seamless (SMLS), Cold Rolled, TIG/Plasma Welded, Laser Welded |
| Outer Diameter (OD) | 1/8" to 36" (6.0 mm – 914.4 mm) | Sanitary Tube: 1/2" – 8" (12.7 – 203.2 mm) |
| Wall Thickness (WT) | SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160S (0.5 mm – 35.0 mm) |
| Primary Material Grades | • Austenitic: TP304, TP304L, TP316, TP316L, TP321, TP310S, TP347H
• Duplex / Super Duplex: S31803 (2205), S32205, S32750 (2507), 904L |
| Standard Specifications | ASTM A312, ASTM A213, ASTM A269, ASTM A270, ASTM A554, EN 10216-5, DIN 17456, JIS G3459 |
| Surface Finish Options | Pickled & Annealed (AP / Industrial White), Bright Annealed (BA), 180#-600# Hairline / Mirror 8K |
| Testing & Inspection | 100% PMI Chemical Test, Hydrostatic Test, Eddy Current / UT Scan, Intergranular Corrosion Test |
02 / CHEMICAL COMPOSITION & MECHANICAL PROPERTIES
? Chemical Composition (wt%)
| Grade / Alloy | Cr (%) | Ni (%) | Mo (%) | C (max) | N (%) / Special |
| TP304 / 1.4301 | 18.0 – 20.0% | 8.0 – 11.0% | — | 0.08% | 0.10% (max) |
| TP304L / 1.4307 | 18.0 – 20.0% | 8.0 – 12.0% | — | 0.03% | 0.10% (max) |
| TP316L / 1.4404 | 16.0 – 18.0% | 10.0 – 14.0% | 2.0 – 3.0% | 0.03% | 0.10% (max) |
| TP321 / 1.4541 | 17.0 – 19.0% | 9.0 – 12.0% | — | 0.08% | Ti: 5×(C+N) min |
| Duplex 2205 | 22.0 – 23.0% | 4.5 – 6.5% | 3.0 – 3.5% | 0.03% | 0.14 – 0.20% |
⚙️ Mechanical Properties
| Grade / Alloy | Yield Strength Rp0.2 (min) | Tensile Strength Rm (min) | Elongation A5 (min) | Hardness (max) |
| TP304 / TP304L | ≥ 205 MPa (30 ksi) | ≥ 515 MPa (75 ksi) | ≥ 35% | ≤ 90 HRB |
| TP316 / TP316L | ≥ 205 MPa (30 ksi) | ≥ 515 MPa (75 ksi) | ≥ 35% | ≤ 90 HRB |
| TP321 / TP310S | ≥ 205 MPa (30 ksi) | ≥ 515 MPa (75 ksi) | ≥ 35% | ≤ 90 HRB |
| Duplex 2205 | ≥ 450 MPa (65 ksi) | ≥ 655 MPa (95 ksi) | ≥ 25% | ≤ 32 HRC |
03 / ENGINEERING ADVANTAGES & KEY FEATURES
| ? Superior Acid & Chloride Resistance | ? High Temperature & Oxidation Stability |
| TP316L (with 2-3% Molybdenum) and Duplex 2205 offer outstanding pitting resistance (PREN ≥ 35) and resistance to stress corrosion cracking in marine and chemical media. | Alloys like TP310S and TP321 operate continuously at temperatures up to 1100°C with exceptional creep strength and resistance to scaling in furnace and boiler applications. |
| ✨ Ultra-Clean Sanitary Inner Surface | ? 100% Positive Material Identification (PMI) |
| Sanitary grade tubes (ASTM A270) feature mechanical or electropolished internal surface roughness down to Ra ≤ 0.4μm, preventing bacterial adhesion and fluid residue. | Every single heat and pipe batch undergoes handheld XRF spectrometry testing to guarantee exact chemical compliance and prevent alloy mix-up. |
04 / 6-STAGE QUALITY CONTROL & TESTING WORKFLOW
| ① PMI RAW CHECK | ② COLD DRAW / TIG | ③ SOLUTION ANNEAL | ④ 100% NDT FLAW SCAN | ⑤ SURFACE PICKLING | ⑥ CLEAN PACKAGING |
| 100% Spectrometric alloy element check. | Precision drawing or automatic orbital welding. | 1050°C heat treatment + rapid water quench. | Hydrostatic test (30MPa) + Eddy Current scan. | Acid pickling passivation or high-grade polish. | End caps, plastic sleeve & wooden crate pack. |
05 / PACKAGING, MARKING & EXPORT STANDARD
| Packaging Category | Standard Handling & Protection |
| Industrial Pipes | Bundled with knitted plastic wrapping, protected with heavy plastic caps on both ends, and tied with steel straps. |
| Sanitary / High-Polish Tubes | Each pipe individually sleeved in protective PE plastic bags, packed in fumigated plywood wooden cases or steel crates. |
| Quality Stencil Marking | Continuous computer-controlled laser or ink-jet marking indicating Alloy, Standard, Size, Heat Number, and Pressure Test. |
Standard Pipe Laser Stencil Format:
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[BRAND NAME] ASTM A312 TP316/316L SEAMLESS COLD DRAWN
OD 2" (60.3MM) SCH 40S WT 3.91MM L=6000MM
HEAT NO.: SS20261027-B9 HYDRO TEST 25 MPA PASS
EN 10204 3.1 MTC ATTACHED | MADE IN CHINA
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06 / FREQUENTLY ASKED QUESTIONS (FAQ)
Q1: What is the key difference between TP304 and TP316L stainless steel pipes?
A: TP316L contains 2.0–3.0% Molybdenum (Mo) and lower carbon content, providing significantly superior resistance to chlorides, seawater, pitting corrosion, and harsh acids compared to TP304.
Q2: What surface finishes do you supply for industrial vs. sanitary use?
A: For industrial piping, we provide Acid Pickled & Annealed (AP) with a uniform matte white finish. For food, dairy, and pharmaceutical sanitary applications, we supply Bright Annealed (BA) or Mechanical/Electropolished finishes with roughness down to Ra ≤ 0.4 μm.
Q3: How do you guarantee the material grade is genuine and not mixed?
A: We perform 100% Positive Material Identification (PMI) on both raw steel billets and finished tubes using calibrated handheld XRF spectrometers before packaging, and provide official EN 10204 3.1 Mill Test Certificates.
Q4: What is your minimum order quantity (MOQ) and lead time?
A: Standard stock sizes (TP304/TP316L SCH10S/40S) have an MOQ of 1 Metric Ton with 7-day dispatch. Custom rolling or special alloy grades require 2–3 Metric Tons with a 15–20 day production lead time.
? FACTORY TRUST & GUARANTEE
? DIRECT MILL PRICING (Premium Billet Source) | ? 100% PMI TESTED (Zero Grade Mix-up) | ? PLYWOOD CRATE PACK (Scratch-Free) | ? EN 10204 3.1 MTC
