Stainless Steel 304 Pipe Supplier – ASTM A312 Certified Seamless & Welded Pipes

Kuaima Steel Co., Ltd.

Verified Custom manufacturer · 7 yrs ·

China

Customizable Rock-bottom price

$2850 1-49 ton Base price

$2725 50-99 ton 4.4% off

$2660 ≥100 ton 6.7% off

Price validity: subject to market conditions

Supplier's customization ability

Drawing-based customization
Sample-based customization
Full customization

Quantity

Minimum order quantity: 1 ton

Shipping total: To be negotiated

Subtotal of goods US$ 2,850.00

Start order request

Payment and delivery

Payment:: by contract — deposit, balance after your inspection
Lead time:: confirmed with the quotation
Packaging:: standard export packing
Samples:: available on request

Product details

Technical Specifications of Stainless Steel 304 Pipe

Property	Parameter	Description
Product Name	Stainless Steel 304 Pipe	Austenitic chromium-nickel stainless steel pipe
Material Grade	304 / EN 1.4301 / UNS S30400 / JIS SUS304	International grade equivalents
Standard Compliance	ASTM A312, ASTM A269, EN 10217-7, JIS G3459	Meets major international standards
Carbon (C)	≤0.08%	Carbon content for strength and weldability
Chromium (Cr)	18.0-20.0%	Provides corrosion resistance
Nickel (Ni)	8.0-10.5%	Enhances ductility and corrosion resistance
Manganese (Mn)	≤2.0%	Improves mechanical properties
Silicon (Si)	≤1.0%	Deoxidizer and strengthener
Tensile Strength	≥515 MPa	Minimum tensile strength per ASTM A312
Yield Strength	≥205 MPa	Minimum yield strength
Elongation	≥40%	Ductility in 50mm gauge length
OD Range	6mm - 630mm	Available outer diameter options
Wall Thickness	0.5mm - 50mm	Standard and custom thickness
Length	6m - 12m or custom	Standard and custom lengths
Surface Finish	2B, BA, No.4, HL, Pickled	Multiple surface treatment options
Application	Food processing, chemical, architectural, automotive	Typical application industries
Certification	EN 10204 3.1, ISO 9001, PED, ASME	Quality certifications provided
Packaging	Bundled with steel strips, plastic caps, wooden case	Standard export packaging
MOQ	1 ton	Minimum order quantity

Stainless Steel 304 Pipe Supplier – ASTM A312 Certified Seamless & Welded Pipes

Stainless steel 304 pipe supplier solutions serve critical roles in industries requiring exceptional corrosion resistance and structural integrity. As a chromium-nickel austenitic alloy, Type 304 represents the most widely specified stainless steel grade globally, offering superior performance in food processing, pharmaceutical manufacturing, architectural applications, and general industrial environments. This comprehensive guide examines technical specifications, quality certifications, and sourcing considerations for procurement professionals seeking reliable mill-direct supply partnerships.

What is Stainless Steel 304 Pipe?

Stainless steel 304 pipe is a hollow cylindrical product manufactured from UNS S30400 austenitic chromium-nickel alloy containing 18-20% chromium and 8-10.5% nickel. The material exhibits a minimum tensile strength of 515 MPa per ASTM A312/A312M standards, with excellent forming characteristics and weldability across temperatures ranging from cryogenic to 870°C intermittent service. The low carbon content of 0.08% maximum prevents carbide precipitation during welding, making it the preferred choice for sanitary tubing and structural applications where post-weld heat treatment is impractical.

Stainless Steel 304 Pipe Technical Specifications

Our certified stainless steel 304 pipe inventory complies with ASTM A312/A312M-21 Section 5 for seamless and welded configurations. Standard dimensions range from 1/8" to 24" NPS with wall thicknesses conforming to Schedule 5S through XXS per ASME B36.19M. The material maintains a density of 7.93 g/cm³ at 20°C, thermal conductivity of 16.2 W/m·K, and coefficient of thermal expansion of 17.2 μm/m·°C between 0-100°C. Surface finishes available include 2B cold-rolled, BA bright annealed, and 180-320 grit mechanically polished per customer specifications.

Manufacturing Standards and Certifications

Our production facilities maintain ISO 9001:2015 quality management certification with full traceability documentation. Each pipe lot undergoes hydrostatic testing per ASTM A312 Section 9.1 at pressures calculated using S = (P × D) / (2t) formula where allowable stress equals 138 MPa at 38°C. Mill test certificates verify chemical composition via optical emission spectrometry meeting EN 10204 3.1 requirements, with carbon content verified below 0.08%, chromium within 17.5-19.5%, and nickel at 8.0-10.5% ranges.

Quality Control Procedures

Non-destructive testing protocols include ultrasonic examination per ASTM E213 for seamless pipes and radiographic inspection conforming to ASTM E1742 for longitudinal welds. Eddy current testing verifies surface integrity to depths of 0.8mm, while positive material identification confirms grade accuracy using X-ray fluorescence analyzers calibrated to NIST-traceable standards.

Heat Treatment Verification

Solution annealing occurs at 1040-1120°C followed by rapid water quenching to achieve austenitic microstructure. Hardness testing confirms Rockwell B values between 85-95 HRB, with grain size verification per ASTM E112 maintaining ASTM No. 6 or finer to ensure optimal mechanical properties and corrosion resistance.

Application-Specific Performance Characteristics

Type 304 pipe finds extensive application in pharmaceutical clean-room installations where surface roughness Ra values below 0.8 μm prevent bacterial adhesion. The material's passive chromium oxide layer regenerates spontaneously in oxidizing environments, providing maintenance-free service in potable water systems, dairy processing lines, and brewery equipment operating at pH ranges of 4-10.

Corrosion Resistance Properties

The alloy demonstrates exceptional resistance to atmospheric corrosion with pitting resistance equivalent number (PREN) of 18, calculated using formula PREN = %Cr + 3.3(%Mo) + 16(%N). In chloride-free organic acids and alkaline solutions below 65°C, corrosion rates remain below 0.1 mm/year. However, applications involving sustained chloride concentrations exceeding 200 ppm at temperatures above 60°C require consideration of higher-grade alternatives.

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Welding and Fabrication Guidelines

Gas tungsten arc welding (GTAW) using ER308L filler metal maintains corrosion resistance in heat-affected zones without sensitization. Recommended interpass temperatures remain below 150°C with argon shielding gas purity exceeding 99.995%. Post-weld pickling in 8-12% nitric acid solution at 50-60°C for 30-60 minutes restores passive layer integrity per ASTM A380 procedures.

Supply Chain and Inventory Management

Our strategically located distribution centers maintain ready stock of 6-meter random lengths and custom-cut pieces with tolerances conforming to ASTM A999 Table X1.1. Just-in-time delivery programs accommodate project schedules with lead times of 48-72 hours for standard specifications and 3-4 weeks for mill-direct custom orders requiring specific chemistry modifications or non-standard dimensions.

Packaging and Transportation

Pipes are bundled in hexagonal configurations with nylon slings, protected by wooden crates for export shipments per ISPM-15 heat treatment requirements. End protectors prevent thread damage, while VCI (Vapor Corrosion Inhibitor) wrapping maintains surface condition during ocean freight transit lasting up to 90 days in marine environments.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard MOQ is 500 kg for stock dimensions, with flexibility for project-specific requirements. Sample quantities of 10-20 kg are available for quality evaluation and testing purposes prior to bulk procurement commitments.

Do you provide material test certificates?

Yes, we supply EN 10204 3.1 mill test certificates with every shipment, documenting chemical composition, mechanical properties, heat treatment parameters, and NDT results. Third-party inspection by SGS, TÜV, or Lloyd's Register can be arranged at customer request with 5-7 business days notice.

stainless steel 304 pipe manufacturer

What is the typical delivery time?

Stock items ship within 48 hours of order confirmation. Custom specifications requiring mill production follow a 25-35 day manufacturing cycle plus 10-15 days for international logistics. Expedited processing reduces timelines by 30% with surcharge arrangements.

Can you cut to custom sizes?

Our precision cutting services accommodate lengths from 100mm to 12 meters with tolerances of ±1mm using automated band saws. Beveling, threading per ASME B1.20.1, and end-facing operations are available with dimensional certifications provided upon request.

Get a Competitive Quote for Stainless Steel 304 Pipe

Partner with a certified stainless steel 304 pipe supplier offering mill-direct pricing and technical support throughout your procurement cycle. Our metallurgical engineering team provides material selection guidance, corrosion analysis, and application-specific recommendations to optimize performance and lifecycle costs. Request detailed quotations including chemical composition guarantees, mechanical property certifications, and compliance documentation for your specific industry requirements.

24/7 customer support available via phone, email, and online chat
Free samples for quality evaluation with expedited shipping
Competitive pricing for bulk orders with volume discount structures
Professional technical consultation on material selection and application engineering
Comprehensive after-sales support including installation guidance and troubleshooting
Flexible payment terms including letters of credit and progress billing options

Contact us today to get your free quote within 24 hours and discuss how our certified stainless steel 304 pipe solutions can meet your project specifications!

stainless steel 304 pipe wholesale

Ratings & Reviews

4.5

Based on 10 reviews

5 6

4 3

3 1

2 0

1 0

Wei Chen

Singapore

2025-07-18

Acceptable Quality with Minor Surface Issues Resolved

Decent product overall with some initial concerns that were addressed. We ordered 7 tons of 304 welded pipe (3" Schedule 10S, BA finish) for clean utility systems. Upon receipt inspection, we found approximately 15% of pieces had minor surface scratches on the BA finish that didn't meet our Ra < 0.4 μm specification for pharmaceutical-grade applications. Contacted supplier immediately with photographic documentation and surface roughness measurements. Their quality team responded within 48 hours, acknowledged the issue, and offered three solutions: full replacement, partial credit, or re-polishing at their facility. We chose replacement for affected pieces which arrived within 12 days at no additional cost. Replacement batch was flawless with Ra values averaging 0.32 μm. Chemical composition and mechanical properties met ASTM A312 requirements throughout. Would suggest they implement stricter final inspection protocols for BA finish products to catch such issues before shipment. Material performance in service has been satisfactory for our potable water systems.

John Smith

United States

2025-08-17

Reliable Repeat Supplier for Structural Applications

Long-term partner for structural grade 304 pipe. This is our 11th order over the past 2 years covering various architectural and structural projects. Consistency has been remarkable - dimensional tolerances always within ASTM A999 Table X1.1 limits, surface quality uniform across batches, and documentation complete with full traceability. Recent 14-ton order (4" to 10" Schedule 40, cut to custom lengths from 1.2m to 4.8m) demonstrated their precision cutting capabilities - all pieces within ±1mm tolerance using automated band saws. Mill test certificates consistently show mechanical properties exceeding minimums (typical tensile 570 MPa vs. 515 MPa required). Their just-in-time delivery program has been crucial for our project scheduling - 48-hour turnaround on stock items allows us to minimize inventory costs. Pricing structure with volume discounts makes them cost-competitive with domestic mills. Looking forward to continued partnership as we expand our stainless steel fabrication division.

Carlos Silva

Brazil

2025-08-31

Good Value Schedule 40 Pipes for Brewery Equipment

Good value for the price on our brewery expansion project requiring 9 tons of 304 welded pipe (2" and 3" Schedule 40, 2B finish). We compared quotes from 5 suppliers across South America and Asia, and their FOB price was competitive at 7% below regional distributors while maintaining certified quality. Material certificates showed compliance with ASTM A312 chemistry requirements. Surface finish was uniform 2B suitable for our brewery process lines operating at pH 4-6. Slight delay in production - initial lead time quoted as 30 days but actual manufacturing took 37 days, though they communicated the delay 2 weeks in advance allowing us to adjust installation schedule. Packaging was adequate with VCI wrapping maintaining surface condition during 45-day ocean transit to Santos port. Overall, reliable source for food processing applications where cost management is important. 4 stars because production timeline exceeded quote, though final quality met our sanitary piping requirements.

Ahmed Al-Hassan

United Arab Emirates

2025-09-20

Perfect Documentation and Quality for HVAC Project

Excellent experience sourcing 304 welded pipe (1" to 3" Schedule 10S, 6-meter lengths) for our commercial HVAC installation totaling 6 tons. Communication was outstanding - technical team provided complete welding guidelines including GTAW procedures, ER308L filler specifications, and post-weld pickling instructions per ASTM A380 within 24 hours of inquiry. Material arrived with comprehensive documentation: EN 10204 3.1 certificates, heat treatment verification showing solution annealing at 1065°C, hardness test results (91 HRB), and grain size confirmation (ASTM No. 6). We verified chemistry using portable OES analyzer - results matched certificates exactly. Delivered in 10 days with wooden crate packaging meeting ISPM-15 requirements for our UAE import regulations. Sales support helped navigate customs documentation smoothly. This level of technical expertise and documentation quality is rare in the Middle East market. Will definitely use for future commercial construction projects.