Global Steel Supply & Processing
ASTM A312/A312M-25 · TP304 / UNS S30400 · SEAMLESS & WELDED
STAINLESS PIPE / BULK PROCUREMENT
Order seamless or straight-seam welded 304 stainless steel pipe for industrial piping, process equipment and distribution. Share NPS or OD, wall schedule, length, process route and required inspections for a structured quotation.
Explore pipe specifications ↓Define material, pipe type and dimensional requirements at the start of your purchasing process.
| Specification | What to state in the RFQ |
|---|---|
| Material / designation | TP304 / UNS S30400 / 304 austenitic stainless steel |
| Primary piping standard | ASTM A312/A312M-25; state the contract edition |
| Nominal pipe dimensions | ASME B36.19-2022, NPS and S-series schedules |
| Manufacturing | Seamless; straight-seam welded; heavily cold-worked welded per applicable product scope |
| Diameter and wall | Specify NPS or OD, Schedule 5S / 10S / 40S / 80S, or dimensioned OD × WT |
| Length and ends | Random length / fixed cut length; plain or prepared ends by agreement |
| Delivery state | Required heat-treated condition; surface finish agreed on order |
| Certificates | Material test report / MTC, heat or lot traceability, agreed inspection results |
| Surface options | Mill, pickled, mechanically polished or specified finish where available |
| Commercial offer | Bulk tonnage or piece quantity, destination, delivery and inspection terms |
Check 18–20% chromium, 8–11% nickel and the full heat analysis before material acceptance.
| Element | TP304 reference composition |
|---|---|
| Chromium (Cr) | 18.00–20.00% |
| Nickel (Ni) | 8.00–11.00% |
| Carbon (C) | 0.080% max. |
| Manganese (Mn) | 2.00% max. |
| Silicon (Si) | 1.00% max. |
| Phosphorus (P) | 0.045% max. |
| Sulfur (S) | 0.030% max. |
Composition shown is a TP304 pipe-material reference; verify limits against the contract edition of ASTM A312 and heat analysis on the MTC.
Assess the actual grade, heat treatment and tensile test results together; these properties inform fabrication and acceptance.
| Property | TP304 reference | Acceptance note |
|---|---|---|
| Minimum tensile strength, Rm | 515 MPa (75 ksi) | Reference minimum for TP304 |
| Minimum 0.2% yield strength, Rp0.2 | 205 MPa (30 ksi) | Reference minimum for TP304 |
| Elongation — longitudinal specimen | 35% | Subject to applicable specimen / test rules |
| Elongation — transverse specimen | 25% | Subject to applicable specimen / test rules |
| Reference density | 7.90 g/cm³ | Used only for theoretical weight estimates |
| Heat-treated delivery | Required by ASTM A312 | Confirm treatment and final condition |
Strength and elongation are reference requirements for the specified material condition, product form and test orientation. Use the ordered ASTM edition and MTC for formal acceptance.
Your pipe class, allowable weld route, inspection plan and installation requirements determine the accepted manufacturing option.
Seamless pipe is manufactured without a longitudinal weld seam. Specify the required OD, wall tolerance, heat-treated condition and inspections for your pipe class.
ASTM A312 also covers straight-seam welded and heavily cold-worked welded forms. State the permitted route, weld treatment and examination requirements in your order.
Compare widely used NPS dimensions. Specify OD and actual nominal wall in millimeters for clear technical review.
| NPS | OD (mm) | SCH 10S (mm) | SCH 40S (mm) | SCH 80S (mm) |
|---|---|---|---|---|
| 1/2 | 21.3 | 2.11 | 2.77 | 3.73 |
| 1 | 33.4 | 2.77 | 3.38 | 4.55 |
| 2 | 60.3 | 2.77 | 3.91 | 5.54 |
| 3 | 88.9 | 3.05 | 5.49 | 7.62 |
| 4 | 114.3 | 3.05 | 6.02 | 8.56 |
| 6 | 168.3 | 3.40 | 7.11 | 10.97 |
| 8 | 219.1 | 3.76 | 8.18 | 12.70 |
| 10 | 273.1 | 4.19 | 9.27 | 12.70 |
| 12 | 323.9 | 4.57 | 9.53 | 12.70 |
Selected nominal values based on ASME B36.19-2022. S-series dimensions are specified separately from non-S schedule designations. Your project documents determine wall tolerance, corrosion allowance and pressure design.
Send your dimensioned pipe schedule for cut lengths, quantities and acceptance review.
Type 304 serves many general corrosion-resistant piping applications, including equipment handling compatible water, food processing fluids and mild industrial media. A sound corrosion assessment uses actual fluid chemistry and cleaning conditions.
Application photographs should match the actual installed environment and pipe use.
A312 pipe is often procured with a mill or pickled surface, while mechanical polishing or designated surface roughness can be requested for selected applications.
Sanitary / hygienic process systems may require a distinct tubing standard, finish and inspection specification.
Match the piping specification to the environment, system design, finishing needs and documentation package.
General-purpose stainless piping for fluids compatible with TP304 and the system design.
Piping and equipment connections where cleaning practice and finish requirements are defined.
Building and industrial water service selected after water-chemistry assessment.
Pipe spools, equipment frames and selected machine assemblies.
Services where the actual temperature and chemical exposure suit 304 stainless.
Standard cut lengths and schedule-based stock replenishment for distributors.
Include a tagged pipe schedule and all required inspection documents in a single RFQ.
Estimate kilograms per meter, per-piece weight and total order tonnes before requesting your factory quotation.
Pick a common NPS and S-series wall schedule, or enter your own OD and nominal wall. Enter pipe length and piece quantity for your estimate.
Manufacturing and finishing operations vary by seamless or welded route. Buyers can specify process, standard, dimensional tolerance and test acceptance on each purchase order.
Company-wide steel operations, procurement coordination and document control can support buyers managing multiple pipe sizes and material specifications.
Specify TP304, route, surface and certificates for each line item.
Reported 8 million MT annual company-wide steel output and 1 million MT regular inventory; TP304 availability is quoted separately.
Align heat records, MTC, testing and independent inspections when requested.
Discuss packaging, fixed lengths, shipment lots and destination-specific requirements.
Align chemical analysis, tensile tests, examination and the final MTC with your pipe specification.
Examination and acceptance depend on the manufacturing route, pipe size, standard edition and supplemental purchase-order requirements.
Agree processing scope, tolerances and available methods at quotation stage.
State exact length, tolerance and piece count by nominal pipe size.
Define square-cut or bevel geometry from the installation or welding drawings.
Confirm the final surface condition, finish designation and required cleanliness.
Ask for size, steel grade, heat references and shipment lot coding where needed.
Use clear line-item identification and cut lists to reduce receiving time.
Protect clean pipe bores and finished ends during shipment.
A precise bill of quantities makes grade, size and delivery discussions more efficient.
Protect pipe surfaces, preserve traceability and keep mixed sizes clear for receiving teams.
Provide delivery port, shipping terms and unloading conditions to receive a shipment-specific quote.
Choose on chemical exposure, welding needs, mechanical design and the project material specification.
| Grade | Selection focus |
|---|---|
| 304 / TP304 | General-purpose 18/8 austenitic stainless piping; this page |
| 304L / TP304L | Lower-carbon 304 variant often specified for welded assemblies |
| 316L / TP316L | Molybdenum-bearing austenitic option for selected chloride exposure |
| 2205 / UNS S32205 | Duplex stainless with higher strength and different pipe standard |
Browse adjacent grades and product forms while keeping the intended pipe standard clear.
Send a consolidated BOM with separate grade, dimensions, test documents and finished lengths.
Practical answers about grade, pipe standards, manufacturing forms, sizing, inspection and purchasing.
TP304 is used in general corrosion-resistant industrial and equipment piping when the service fluid, operating temperature and cleaning chemistry suit this alloy.
ASTM A312/A312M-25 is the current pipe specification for seamless, straight-seam welded and heavily cold-worked austenitic stainless steel pipe within its scope.
304L has a lower specified carbon limit and is often selected for welded fabrication. The grade and fabrication rules should be confirmed for the intended service.
Yes. Specify the acceptable route according to ASTM A312 and the project piping class; availability and inspections are confirmed by quotation.
ASME B36.19 identifies stainless S-series schedules such as 5S, 10S, 40S and 80S for applicable NPS sizes. State exact OD and wall when necessary.
They are different product standards. ASTM A269 covers austenitic stainless tubing for general service, while ASTM A312 addresses qualifying piping forms.
304 can serve many environments, but chloride concentration, temperature, crevices and cleaning chemicals affect pitting and stress corrosion cracking risk. Assess the design conditions.
Reference minimum tensile strength is 515 MPa and yield strength is 205 MPa for the relevant ASTM A312 material condition. Confirm actual test results on the MTC.
Use nominal outside diameter, wall thickness, length, quantity and a reference density of 7.90 g/cm³. The page calculator gives steel-only theoretical mass.
Specify chemical analysis, mechanical tests, dimensional inspection, applicable hydrostatic or electric NDE, surface condition and any third-party witness requirements.
Cut lengths, plain ends, bevels and selected surface finishes can be discussed with the quotation based on dimensions and processing capability.
Provide ASTM grade and edition, seamless/welded route, OD or NPS, wall or schedule, lengths, piece counts, surface, testing, destination and required delivery term.
Send your piping BOQ, required ASTM edition, OD / NPS, wall schedule, manufacturing route, finish and MTC requirements. Our team will review the complete scope and prepare a product-specific quotation.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.
