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- SS SMLS PIPE TP304 ASTM A312
TP304 Stainless Steel Welded Pipes & Tubes - China Suppliers & Factory for Fast Delivery
Introduction
TP304 is a widely used austenitic stainless steel welded tube specified under standards such as ASTM A312/A312M (for welded pipes) and ASTM A269 (for general-service tubing). As part of the 300-series stainless steels, TP304 offers a balanced combination of corrosion resistance, formability, and cost-effectiveness. It is non-magnetic in the annealed state and contains 18-20% chromium and 8-10.5% nickel, making it suitable for diverse industrial, architectural, and sanitary applications. The higher carbon content (≤0.08%) compared to TP304L provides slightly enhanced strength but requires careful welding practices to avoid sensitization.
Key Features
Chemical Composition
Higher carbon content improves strength but increases susceptibility to sensitization (chromium carbide precipitation) during welding.
Mechanical Properties
Higher strength than TP304L but requires post-weld annealing in corrosive environments to restore corrosion resistance.
Temperature Resistance
Operating Range: -200°C to 400°C (-328°F to 752°F).
Avoid Sustained Use above 425°C (797°F) to prevent sensitization.
Avoid Sustained Use above 425°C (797°F) to prevent sensitization.
Surface Finishes
Common finishes: Annealed, pickled, polished (#4 brushed, BA bright annealed), or electropolished.
Sanitary applications: Mirror-like finishes (Ra ≤ 0.8 μm) compliant with 3-A Sanitary Standards.
Sanitary applications: Mirror-like finishes (Ra ≤ 0.8 μm) compliant with 3-A Sanitary Standards.
Key Advantages
- Versatility: Balances performance, cost, and ease of fabrication.
- Aesthetic Appeal: Polished finishes for architectural and sanitary uses.
- Weldability: Easily fabricated with standard techniques (post-weld annealing optional based on application).
Why Choose TP304 Over TP304L?
- Higher Strength: Better mechanical properties for non-welded or lightly welded applications.
- Cost-Efficiency: Lower initial cost than 316/L or duplex grades in mild environments.
- Availability: Widely produced and stocked globally.
Material Specification
Standard
ASTM A312/A312M (A269 & A312 & A270), ASME SA312, EN 10296-2
O.D. Range
1/8" NB to 32" NB (10.29mm - 812.80mm) (Customization Available)
W.T. Schedule
SCH 10S, SCH 40S, SCH 80S, SCH160, SCH XXS (Customization Available)
Applications
Food & Beverage, Architecture & Construction, Chemical & Petrochemical, Automotive, Pharmaceuticals, General Engineering
End Types
Plain End, Beveled End, Threaded
Processing Services
Cut-to-length, Polishing
Inspection & Testing
100% PMI Tested, EN10204 3.1B Mill Test Certificate, Third Party Inspection Accepted
Delivery Conditions
Cold Drawn, Annealed and Pickled, Polished, Bright Annealed, Sand Blasting, Shot Blasting
Marking Details
Standard, Grade, OD, Thickness, Length, Heat No. (Or as per request)
Packaging
Packed in Wooden Boxes, Plywood Cases, Steel Strips Bundled, or as requested
Specification Parameters
TP304 Chemical Composition
| Heat No. | Chemical Composition (%) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Ni | Cr | Mo | ||
| STAND. | MIN. | - | - | - | - | - | 8.00 | 18.00 | - |
| MAX. | 0.080 | 2.00 | 0.045 | 0.030 | 1.00 | 11.00 | 20.00 | - | |
TP304 Mechanical Properties
| Mechanical Properties | |||||
|---|---|---|---|---|---|
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness Rockwell B (HR B) | Hardness Brinell (HB) |
| TP304 | 515 | 205 | 35 | 90 | 187 |
Equivalent Grades - (TP304 ASTM A312/A312M (A269 & A312 & A270) Equivalent Grades)
| TP304 ASTM A312 (A269 & A312 & A270) Equivalent Grades | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| USA (ASTM / AISI) | Germany (DIN, WNr) | Japan (JIS) | France (AFNOR) | England (BS) | Euronorms (EN) | Italy (UNI) | Spain (UNE) | China (GB) | Sweden (SS) | Poland (PN) | Czech (CSN) | Austria (ONORM) |
| 304 304H S30400 |
1.4301 1.5301 X5CrNi18-10 X5CrNi18-9 X6CrNi18-9 |
SUS304 | 304F00 X5CN18-10 Z4CN19-10FF Z5CN17-08 Z6CN18-09 Z7CN18-09 |
304S11 304S15 304S16 304S17 304S18 304S25 304S31 |
1.4301 1.4948 X5CrNi18-10 X6CrNi18-10 |
X3CrNi18-10 X5CrNi18-10 |
F.3504 F3551 X5CrNi18-10 |
0Cr19Ni9 0Cr18Ni9 |
2332 2333 |
0H18N9 | 17240 | X5CrNi18-10OS |
ASTM A312/A312M Standard Cold Machining Size Deviation Permitted
| ASTM A312/A312M-09 Standard cold machining size deviation permitted | |||||
|---|---|---|---|---|---|
| Nominal Outside Diameter | OD mm | Allowable Deviation | Nominal Wall Thickness | WT mm | Allowable Deviation |
| 1/8" - 1 1/2" | (10.29 - 48.26) | +0.4 / -0.8 | 1/8" - 1 1/2" | (10.29 - 73.03) all of t | +20% / -12.5% |
| >1 1/2" - 4" | (48.26 - 114.3) | ±0.8 | 3" - 18" | (88.9 - 457.2) t/D=5% | +22.5% / -12.5% |
| >4" - 8" | (114.3 - 219.08) | +1.6 / -0.8 | 3" - 18" | (88.9 - 457.2) t/D>5% | +15% / -12.5% |
| >8" - 18" | (219.08 - 457.2) | +2.4 / -0.8 | ≥20" | =508 t of wld pipe | +17.5% / -12.5% |
| >18" - 26" | (457.2 - 660.4) | +3.2 / -0.8 | ≥20" | =508 t/D=5% | +22.5% / -12.5% |
| >26" - 34" | (660.4 - 863.6) | +4.0 / -0.8 | ≥20" | =508 t/D>5% | +15% / -12.5% |
| >34" - 48" | (863.6 - 1219.2) | +4.8 / -0.8 | - | - | - |
| Thin wall pipe (t/D=3%) ovality condition: Any cross section in a steel pipe Dmax - Dmin = 1.5% nominal, and (Dmax - Dmin)/2 conforms to the stipulated diameter tolerance range. | |||||
ASTM A269/A269M Standard Cold Machining Size Deviation Permitted
| ASTM A269/A269M Standard cold machining size deviation permitted | ||||||
|---|---|---|---|---|---|---|
| Group | Size, Outside Diameter, in. [mm] | Permissible Variations in Outside Diameter, in. [mm] | Permissible Variations in Wall Thickness, % | Cut Length Over, in. [mm] | Cut Length Under, in. [mm] | Thin Walled Tubes |
| 1 | Up to 1/2 [13] | ±0.005 [0.13] | ±15 | 1/8 [3.2] | 0 | ... |
| 2 | 1/2 to 1 1/2 [13 to 38], excl | ±0.005 [0.13] | ±10 | 1/8 [3.2] | 0 | less than 0.065 in. [1.65 mm] nominal |
| 3 | 1 1/2 to 3 1/2 [38 to 89], excl | ±0.010 [0.25] | ±10 | 3/16 [4.8] | 0 | less than 0.095 in. [2.41 mm] nominal |
| 4 | 3 1/2 to 5 1/2 [89 to 140], excl | ±0.015 [0.38] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 5 | 5 1/2 to 8 [140 to 203], excl | ±0.030 [0.76] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 6 | 8 to 12 [203 to 305], excl | ±0.040 [1.01] | ±10 | 3/16 [4.8] | 0 | less than 0.200 in. [5.08 mm] nominal |
| 7 | 12 to 14 [305 to 356], excl | ±0.050 [1.26] | ±10 | 3/16 [4.8] | 0 | less than 0.220 in. [5.59 mm] nominal |
ASTM A270/A270M Standard Cold Machining Size Deviation Permitted
| ASTM A270/A270M Standard cold machining size deviation permitted | ||||
|---|---|---|---|---|
| Size, Outside Diameter, in. [mm] | Permissible Variations in Outside Diameter, in. [mm] | Permissible Variations in Cut Length, in. [mm] | ||
| Over | Under | Over | Under | |
| 1.000 [25] and under | 0.005 [0.13] | 0.005 [0.13] | 1/8 [3] | 0 |
| Over 1 [25] to 2 [50] | 0.008 [0.20] | 0.008 [0.20] | 1/8 [3] | 0 |
| Over 2 [50] to 3 [75] | 0.010 [0.25] | 0.010 [0.25] | 1/8 [3] | 0 |
| Over 3 [75] to 4 [100] | 0.015 [0.38] | 0.015 [0.38] | 1/8 [3] | 0 |
| Over 4 [100] to 5 1/2 [140], excl | 0.015 [0.38] | 0.015 [0.38] | 3/16 [5] | 0 |
| 5 1/2 [140] to 8 [200], excl | 0.030 [0.75] | 0.030 [0.75] | 3/16 [5] | 0 |
| 8 [200] to 12 [300] | 0.050 [1.25] | 0.050 [1.25] | 3/16 [5] | 0 |
Comparison Table Of American Standard Dimensions - (ANSI B36.19 & ANSI B36.10)
| OD DN | IN | OD MM | ANSI B36.19 | - | ANSI B36.10 | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal diameter in inches | ||||||||||||||||||||
| 5s | 10s | Sched.40s | Sched.40 | Sched.80s | Sched.80 | 10 | 20 | 30 | Standard | |||||||||||
| mm | Kg/m | mm | Kg/m | mm | Kg/m | mm | mm | Kg/m | mm | mm | Kg/m | mm | Kg/m | mm | Kg/m | mm | Kg/m | |||
| 6 | 1/8" | 10.29 | - | - | 1.24 | 0.281 | 1.73 | 0.371 | 1.73 | 2.41 | 0.467 | 2.41 | - | - | - | - | - | - | 1.73 | 0.371 |
| 8 | 1/4" | 13.72 | - | - | 1.65 | 0.499 | 2.24 | 0.644 | 2 | 3.02 | 0.809 | 3.02 | - | - | - | - | - | - | 2.24 | 0.644 |
| 10 | 3/8" | 17.14 | - | - | 1.65 | 0.64 | 2.31 | 0.858 | 2.31 | 3.2 | 1.118 | 3.2 | - | - | - | - | - | - | 2.31 | 0.858 |
| 15 | 1/2" | 21.34 | 1.65 | 0.814 | 2.11 | 1.016 | 2.77 | 1.26 | 2.77 | 3.73 | 1.62 | 3.73 | - | - | - | - | - | - | 2.77 | 1.26 |
| 20 | 3/4" | 26.67 | 1.65 | 1.034 | 2.11 | 1.298 | 2.87 | 1.68 | 2.87 | 3.91 | 2.19 | 3.91 | - | - | - | - | - | - | 2.87 | 1.68 |
| 25 | 1" | 33.4 | 1.65 | 1.312 | 2.77 | 2.125 | 3.38 | 2.5 | 3.38 | 4.55 | 3.23 | 4.55 | - | - | - | - | - | - | 3.36 | 2.5 |
| 32 | 1 1/4" | 42.16 | 1.65 | 1.674 | 2.77 | 2.732 | 3.56 | 3.38 | 3.56 | 4.85 | 4.46 | 4.85 | - | - | - | - | - | - | 3.56 | 3.38 |
| 40 | 1 1/2" | 48.26 | 1.65 | 1.926 | 2.77 | 3.155 | 3.68 | 4.05 | 3.68 | 5.08 | 5.4 | 5.08 | - | - | - | - | - | - | 3.68 | 4.05 |
| 50 | 2" | 60.32 | 1.65 | 2.424 | 2.77 | 3.992 | 3.91 | 5.43 | 3.91 | 5.54 | 7.47 | 5.54 | - | - | - | - | - | - | 3.91 | 5.43 |
| 65 | 2 1/2" | 73.02 | 2.11 | 3.747 | 3.05 | 5.345 | 5.16 | 8.62 | 5.16 | 7.01 | 11.4 | 7.01 | - | - | - | - | - | - | 5.16 | 8.62 |
| 80 | 3" | 88.9 | 2.11 | 4.585 | 3.05 | 6.557 | 5.49 | 11.28 | 5.49 | 7.62 | 15.25 | 7.62 | - | - | - | - | - | - | 5.49 | 11.28 |
| 90 | 3 1/2" | 101.6 | 2.11 | 5.272 | 3.05 | 7.526 | 5.74 | 13.56 | 5.74 | 8.08 | 18.62 | 8.08 | - | - | - | - | - | - | 5.74 | 13.56 |
| 100 | 4" | 114.3 | 2.11 | 5.945 | 3.05 | 8.496 | 6.02 | 16.06 | 6.02 | 8.56 | 22.29 | 8.56 | - | - | - | - | - | - | 6.02 | 16.06 |
| 125 | 5" | 141.3 | 2.77 | 9.639 | 3.4 | 11.74 | 6.55 | 21.76 | 6.55 | 9.52 | 30.92 | 9.52 | - | - | - | - | - | - | 6.55 | 21.76 |
| 150 | 6" | 168.28 | 2.77 | 11.514 | 3.4 | 14.037 | 7.11 | 28.23 | 7.11 | 10.97 | 42.52 | 10.97 | - | - | - | - | - | - | 7.11 | 28.23 |
| 200 | 8" | 219.08 | 2.77 | 15.049 | 3.76 | 20.334 | 8.18 | 42.49 | 8.18 | 12.7 | 64.57 | 12.7 | - | - | 6.35 | 33.28 | 7.04 | 36.8 | 8.18 | 42.4 |
| 250 | 10" | 273.05 | 3.4 | 23.028 | 4.19 | 28.29 | 9.27 | 60.24 | 9.27 | 12.7 | 81.46 | 15.09 | - | - | 6.35 | 41.7 | 7.8 | 51 | 9.27 | 60.24 |
| 300 | 12" | 323.85 | 3.96 | 31.806 | 4.57 | 36.633 | 9.52 | 73.76 | 10.31 | 12.7 | 97.36 | 17.48 | - | - | 6.35 | 49.68 | 8.38 | 65.14 | 9.52 | 73.76 |
| 350 | 14" | 355.6 | 3.98 | 34.99 | 4.78 | 42.102 | 9.52 | - | 11.13 | - | - | 19.05 | 6.35 | 54.63 | 7.92 | 67.98 | 9.52 | 81.21 | 9.52 | 81.21 |
| 400 | 16" | 406.4 | 4.19 | 42.35 | 4.78 | 48.22 | 9.52 | - | 12.7 | - | - | 21.44 | 6.35 | 62.58 | 7.92 | 77.9 | 9.52 | 93.13 | 9.52 | 93.18 |
| 450 | 18" | 457.2 | 4.19 | 47.7 | 4.78 | 54.3 | 9.52 | - | 14.27 | - | - | 23.82 | 6.35 | 70.5 | 7.92 | 87.8 | 11.13 | 122.12 | 9.52 | 105.05 |
| 500 | 20" | 508 | 4.77 | 60.32 | 5.54 | 69.766 | 9.52 | - | 15.09 | - | - | 26.19 | 6.35 | 78.47 | 9.52 | 116.97 | 12.7 | 155 | 9.52 | 116.97 |
| 550 | 22" | 558.8 | 4.77 | - | 5.54 | - | 9.52 | - | - | - | - | 28.58 | 6.35 | 86.42 | 9.52 | 128.89 | 12.7 | 170.86 | 9.52 | 128.89 |
| 600 | 24" | 609.6 | 5.54 | 84.1 | 6.35 | 96.215 | 9.52 | - | 17.48 | - | - | 30.96 | 6.35 | 96.215 | 9.52 | 140.8 | 14.7 | 209.54 | 9.52 | 140.81 |
| 650 | 26" | 660.4 | - | - | - | - | 9.52 | - | - | - | - | - | 7.92 | 127.58 | 12.7 | 202.65 | - | - | 9.52 | 152.73 |
| 700 | 28" | 711.2 | - | - | - | - | 9.52 | - | - | - | - | - | 7.92 | 137.52 | 12.7 | 218.54 | 15.88 | 271.94 | 9.52 | 164.65 |
| 750 | 30" | 762 | 6.35 | 120.59 | 7.92 | 147.45 | 9.52 | - | - | - | - | - | 7.92 | 147.45 | 12.7 | 234.44 | 15.88 | 291.81 | 9.52 | 176.57 |
| 800 | 32" | 812 | - | - | - | - | 9.52 | - | 17.48 | - | - | - | 7.92 | 157.39 | 12.7 | 250.33 | 15.88 | 311.67 | 9.52 | 188.5 |
| 850 | 34" | 863.6 | - | - | - | - | 9.52 | - | 17.48 | - | - | - | 7.92 | 167.32 | 12.7 | 266.22 | 15.88 | 331.54 | 9.52 | 200.42 |
| 900 | 36" | 914.4 | - | - | - | - | 9.52 | - | 19.05 | - | - | - | 7.92 | 177.26 | 12.7 | 282.18 | 15.88 | 351.41 | 9.52 | 212.34 |
Frequently Asked Questions (FAQ)
What standard specifications does TP304 stainless steel conform to?
TP304 welded tubes comply with major international standards including ASTM A312/A312M (for welded pipes), ASTM A269 (for general-service tubing), ASTM A270, ASME SA312, and EN 10296-2.
What is the temperature range limit for using TP304?
The standard operating range is -200°C to 400°C (-328°F to 752°F). It is highly recommended to avoid sustained use above 425°C (797°F) to prevent sensitization and maintain corrosion resistance.
Why would a project choose TP304 over TP304L?
TP304 has a higher carbon content (≤0.08%), which provides higher mechanical strength compared to TP304L. It is also highly cost-efficient and widely available for non-welded or lightly welded applications.
What surface finishes are available for TP304 sanitary applications?
For sanitary applications, mirror-like polished finishes (Ra ≤ 0.8 μm) that comply with 3-A Sanitary Standards are available, alongside standard finishes such as annealed, pickled, and bright annealed.
How is the quality of TP304 tubes guaranteed?
TP304 tubes undergo rigorous quality checks, including 100% PMI (Positive Material Identification) testing. They are delivered with EN10204.3.1B Mill Test Certificates, and third-party inspections are accepted.