What is ASTM A312 TP304 Stainless Steel Pipe?
ASTM A312 TP304 stainless steel pipe is one of the most widely used austenitic stainless steel pipe grades under ASTM A312 standard. It contains approximately 18% chromium and 8% nickel, which provides excellent corrosion resistance, oxidation resistance, and good mechanical strength.
TP304 stainless steel pipe is available in seamless and welded forms, and it is commonly used in high-temperature and corrosive environments such as chemical processing, food production, oil & gas transportation, and industrial piping systems.
Compared with carbon steel pipes, TP304 offers significantly better resistance to rust and chemical corrosion, making it a preferred material for long-term service applications.
ASTM A312 TP304 Chemical Composition
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
👉 High Cr + Ni content ensures excellent corrosion resistance and formability.
Mechanical Properties of TP304 Stainless Steel Pipe
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 201 HB |
ASTM A312 TP304 Pipe Size Chart
Outer Diameter (OD)
1/8" to 48" (Seamless & Welded)
Wall Thickness (Schedule)
SCH 5S / SCH 10S / SCH 40S / SCH 80S / SCH 160
Length
6 meters / 12 meters / Custom cut length
👉 Available forms:
Seamless pipe (SMLS)
Welded pipe (ERW / EFW)
TP304 Stainless Steel Pipe Key Features
Excellent corrosion resistance in most environments
Good welding and forming performance
High temperature resistance
Strong mechanical strength
Long service life with low maintenance cost
Suitable for hygienic applications (food & pharma)
ASTM A312 TP304 Applications
TP304 stainless steel pipe is widely used in:
Oil & Gas pipeline systems
Chemical processing plants
Food & beverage industry
Pharmaceutical equipment
Heat exchangers
Boilers and pressure systems
Water treatment systems
Structural and industrial piping
TP304 vs TP304L vs TP316 Stainless Steel Pipe Comparison Table
| Item | TP304 Stainless Steel Pipe | TP304L Stainless Steel Pipe | TP316 Stainless Steel Pipe |
|---|---|---|---|
| Standard | ASTM A312 / ASME SA312 | ASTM A312 / ASME SA312 | ASTM A312 / ASME SA312 |
| Material Type | Austenitic Stainless Steel | Low Carbon Austenitic Stainless Steel | Mo-bearing Austenitic Stainless Steel |
| Chromium (Cr) | 18–20% | 18–20% | 16–18% |
| Nickel (Ni) | 8–11% | 8–12% | 10–14% |
| Molybdenum (Mo) | - | - | 2–3% |
| Carbon (C) | ≤0.08% | ≤0.03% | ≤0.08% |
| Corrosion Resistance | Good | Good (better weld stability) | Excellent (chloride resistant) |
| Chloride Resistance | Low | Low | High |
| Welding Performance | Good | Excellent | Good |
| Mechanical Strength | High | Medium–High | High |
| Cost Level | Medium | Medium | High |
| Typical Application | General industry, food, water systems | Welded piping systems, chemical plants | Marine, offshore, chemical, pharma |
| Recommended Use | Cost-effective general use | Welding-heavy structures | Harsh / corrosive environments |
✔ TP304 → General industrial piping (cost-effective)
✔ TP304L → Welding-heavy systems (low carbon advantage)
✔ TP316 → High corrosion & marine environment (best protection)
Manufacturing Standard & Quality Control
ASTM A312 TP304 pipes are manufactured under strict quality control systems:
Raw material spectrochemical testing
Ultrasonic testing (UT)
Hydrostatic pressure test
Eddy current test (ECT)
Dimensional inspection
Mechanical property testing
Certification:
ASTM A312
ASME SA312
EN ISO quality system
Mill Test Certificate (MTC 3.1)
Inspection & Quality Assurance
All TP304 stainless steel pipes undergo:
100% visual inspection
Third-party inspection (SGS / BV / TUV available)
Heat number traceability
Surface finish inspection (pickled / polished / bright annealed)
👉 Ensures compliance with international piping standards.
Why Choose TP304 Stainless Steel Pipe?
Cost-effective stainless steel grade
Global standard material (ASTM A312)
Stable supply chain availability
Suitable for multiple industries
Excellent balance between cost and performance
Packaging & Delivery Standards
Bundled with steel strip
Plastic caps protection
Waterproof wrapping
Wooden box / steel frame (export packing)
Standard export shipping marking
Delivery options:
FOB / CIF / CFR available
Fast production lead time
Global export supply
FAQ
What is ASTM A312 TP304 stainless steel pipe?
It is a standard austenitic stainless steel pipe with 18% Cr and 8% Ni, widely used in industrial piping systems.
Is TP304 stainless steel pipe rust-proof?
TP304 has excellent corrosion resistance but is not completely rust-proof in extreme chloride environments.
What is difference between TP304 and TP304L?
TP304L has lower carbon content, making it better for welding applications.
Can TP304 pipe be used in high temperature?
Yes, TP304 performs well in elevated temperature environments up to industrial limits.
What is ASTM A312 used for?
It covers seamless and welded stainless steel pipes for high temperature and general corrosive services.
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