Products Description

Our Seamless Stainless Steel Tubing covers all grades wholesale clients require-including 300 series (304 304L 316L 316Ti) 200 series (201 202) 400 series and duplex grades. Each grade adheres to core European and North American standards such as ASTM A213 for high-temperature use ASTM A312 for pressure piping and EN10216 for seamless steel tubes ensuring compatibility with your clients' existing systems.

Take our 316L Seamless Stainless Steel Tubing as an example-it contains 16-18% chromium and 2-3% molybdenum which keeps its corrosion rate in 3.5% NaCl (simulated seawater) below 0.01 mm/year far better than 304's 0.05 mm/year. For high-heat applications our 310S tubing withstands up to 1150°C with a tensile strength of ≥515 MPa (tested to ASTM E8) outperforming carbon steel tubes that fail at 450°C.

Dimensions are tailored to real-world use: round tubing has an outer diameter from 1mm (3/8") to 5000mm (100") and wall thickness 0.1mm to 50mm (SCH10 to SCH140), while square tubing ranges from 4mm×4mm to 800mm×800mm with 1mm to 150mm thickness (SCH10 to XXS). Hot rolled options work for industrial piping-like in oil refineries where thick-walled SCH140 round tubing handles high pressure-while cold rolled is perfect for sanitary setups, such as 304L cold rolled round tubing in dairy plants (its smooth surface prevents bacteria buildup).

Take our 316L Seamless Stainless Steel Tubing: it's a go-to for marine clients, as its corrosion rate in seawater (3.5% NaCl) is below 0.01 mm/year-we've supplied it to offshore platforms where it's lasted 15+ years without replacement. For high-heat applications, 310S round tubing stands up to 1150°C, making it ideal for chemical plants' heat exchangers. Even architectural clients use our square 304 tubing for building facades-its bright finish and 20mm×20mm size adds both style and durability.

Factory Processing

Every Seamless Stainless Steel Tubing goes through processing tailored to its end use. For round tubing used in oil&gas (like ASTM A312 grade 316L), we start with hot piercing to create a uniform hole in steel billets-this ensures wall thickness tolerance stays within ±0.03 mm, critical for withstanding pipeline pressure. Square tubing for architectural projects gets extra machining to keep corner angles sharp (90° ±0.5°), so it lines up perfectly for facade installations.

We offer four surface treatments that match client needs: polishing (Ra ≤ 0.4 μm) for 304L cold rolled tubing in pharmaceutical labs (easy to sanitize), annealing (1050-1100°C vacuum furnace) for 310S tubing in heat exchangers (reduces stress to prevent cracking), pickling for 316L marine tubing (removes oxide scales that attract corrosion), and bright finishing for 304 square tubing in retail spaces (gives a sleek, reflective look). Every batch passes ASTM A262 Practice E intergranular corrosion testing-100% pass rate, which we've verified for clients supplying to food safety regulators.

For custom orders, we cut to length with laser precision (±0.05 mm tolerance). One client needed 3m lengths of 25mm OD 316L round tubing for a brewery's beer lines-we delivered 500+ pieces, all matching their exact specs. Each Seamless Stainless Steel Tubing is marked with grade, size, batch number, and standard, so clients can trace it back to production-essential for industries like aerospace that require full compliance records.

Production Strength

Our factory is built to handle large wholesale orders of Seamless Stainless Steel Tubing, with 12 dedicated lines: 4 for round tubing (including ones for extra-large 5000mm OD industrial pipes), 3 for square tubing, 3 for hot rolling (for tough SCH140 grades), and 2 for cold rolling (for sanitary grades). This setup gives us 20000 tons annual capacity-enough to fulfill an 800-ton order for a chemical plant (316L round tubing, SCH40) in just 2 weeks, which is 30% faster than our competitors.

We use top-tier equipment: German SMS piercing mills for round tubing (ensures even wall thickness for high-pressure use), Japanese CNC extrusion machines for square tubing (keeps dimensions consistent for architectural projects), and XRF analyzers in our lab (checks chemical composition with 0.001% accuracy-critical for 347H grade, which needs precise chromium content for high-temperature strength). Every tube gets ultrasonic testing-we once caught a tiny internal defect in a batch of 309S tubing, preventing a client's furnace failure.

We keep 1200+ tons in stock, covering popular grades (304, 304L, 316L) and sizes: round (10mm-200mm OD for food/chemical use) and square (20mm×20mm-100mm×100mm for architecture). A restaurant supply client recently ordered 100 tons of 15mm OD 304 cold rolled round tubing-we shipped it same-day from stock. For rare grades, like 309S (used in industrial ovens) or 347H (for power plant boilers), we produce in 4-5 weeks with the same checks. We even supplied 200 tons of duplex grade tubing to an offshore wind farm-they needed it to resist saltwater corrosion, and our testing proved it meets EN10216 standards.

Factory Commitments

For wholesale clients ordering 150+ tons of Seamless Stainless Steel Tubing, we offer 8% off-plus free surface treatment and free shipping to major ports (Rotterdam for European clients, Houston for North American ones). One client ordered 300 tons of 316L round tubing for a desalination plant-they saved 24000+ dollars with the discount, plus free pickling to boost corrosion resistance.

We back every Seamless Stainless Steel Tubing with a 12-year warranty. If a tube fails due to defects-like a 316L marine tube with corrosion rate over 0.02 mm/year, or a 310S tube that can't handle 1150°C-we replace it for free, no paperwork hassle. A marine client had 10 defective 50mm OD tubes; we shipped replacements in 48 hours and covered return costs.

If clients need third-party inspection (SGS, BV, TÜV), we arrange it for free. A pharmaceutical client required SGS testing for 304L cold rolled tubing-we coordinated the visit and shared results within 3 days. Mistakes happen: once we sent 100mm×100mm square tubing instead of 80mm×80mm for a mall facade-we fixed it in 72 hours, shipping correct pieces via express. We also offer flexible payment: T/T (30% deposit, 70% before shipment) or L/C at sight-works for clients like a European distributor who prefers L/C for large orders. Our goal is to make your wholesale business run smoothly, whether you're supplying breweries, refineries, or architects.

Product Parameters

Item	Stainless Steel Tube/Pipe
Steel grade	200series,300 series,400series,duplex
Standard	ASTM A213,A312,ASTM A269,ASTM A778,ASTM A789,DIN 17456, DIN17457,DIN 17459,JIS G3459,JIS G3463,GOST9941,EN10216,BS3605,GB13296
Material	304,304L,309S,310S,316,316Ti,317,317L,321,347,347H,304N,316L, 316N,201,202
Surface	Polishing,annealing,pickling,bright
Type	hot rolled and cold rolled
stainless steel round pipe/tube
Size	Wall thickness	0.1mm-50mm(SCH10-Sch140)
	Outer diameter	1mm-5000mm (3/8"-100")
stainless steel square pipe/tube
Size	Wall thickness	1mm-150mm(SCH10-XXS)
	Outer diameter	4mm4mm-800mm800mm

Chemical Composition

Steel Grade	Core Chemical Composition (%)	Key Standard (Europe/North America)	Typical Use
201	C≤0.15; Cr16-18; Ni3.5-5.5	ASTM A269	Low-corrosion general piping
202	C≤0.15; Cr17-19; Ni4-6; Mn7.5-10	ASTM A269	Moderate humidity setups
304	C≤0.08; Cr18-20; Ni8-10.5	ASTM A213/A312	Sanitary/low-temp pressure piping
304L	C≤0.03; Cr18-20; Ni8-12	ASTM A269/A778	Food/pharmaceutical water lines
309S	C≤0.08; Cr22-24; Ni12-15	ASTM A213/EN10216	High-temp furnace tubing
310S	C≤0.08; Cr24-26; Ni19-22	ASTM A213/EN10216	1150°C max heat exchangers
316	C≤0.08; Cr16-18; Ni10-14; Mo2-3	ASTM A312/BS3605	Chemical/oil&gas pressure piping
316L	C≤0.03; Cr16-18; Ni10-14; Mo2-3	ASTM A269/A789	Marine/seawater tubing
321	C≤0.08; Cr17-19; Ni9-12; Ti-stab	ASTM A213/EN10216	400-800°C boiler tubes
347H	C0.04-0.10; Cr17-19; Ni9-13; Nb-stab	ASTM A213/EN10216	1000°C+ industrial furnaces
Duplex (S32760)	C≤0.03; Cr24-26; Ni6-8; Mo3-4	ASTM A789/EN10216	Desalination/seawater cooling