ASME SA213 TP316Ti Seamless Stainless Steel U Bend Tube 25.4 X 1.65mm Min Thickness Heat Exchanger / Superheater / Boiler

• Customization: Available
• Type: Stainless Steel Pipes
• Standard: ASTM, AISI, GB, JIS, DIN, EN, GOST 9941-2022
• Model NO.: 316Ti U tube
• Grade: 300 Series
• Certification: ISO
• Shape: U Channel
• Technique: Cold-Drawing
• Surface Treatment: AP/BA/Polishing/Sand Blasting/Shot Blasting
• Material: 316Ti Stainless Steel
• Outer Diameter: 1/8inch-24inch
• Wall Thickness: Sch10s~Sch160
• Length: Random Length or Fixed Length
• Test: Hydraulic Test /Eddy Current Test/Ultrasonic Test
• Delivery Time: Stock 7 Days; MTO 35 Days
• Trade Terms: EXW, FCA, FOB, CFR, CIF etc.
• Markings: According to A999/A999m
• Transport Package: Packed in Bundles or Plywooden Box
• Specification: U tube
• Trademark: GH-STEEL
• Origin: China
• HS Code: 7304419000
• Production Capacity: 2000 Tons Per Month

Product Description

Product Name	ASME SA213 TP316Ti Seamless Stainless Steel U Bend Tube 25.4 X 1.65mm Min Thickness Heat Exchanger / Superheater / Boiler
Process	Stainless steel U-tubes—formed by precision cold bending of seamless tubing—are core components for U-tube heat exchangers. They offer excellent thermal conductivity, superior corrosion resistance, and stable mechanical performance under cyclic thermal loading. All tubes undergo full heat treatment post-bending to relieve residual stress and ensure defect-free curvature (no cracking, wrinkling, or excessive ovality). Custom dimensions and bend radii are available per customer drawings.
Company	Wenzhou Guohao Steel Co., Ltd. — Manufacturer and Exporter of Stainless Steel and Nickel Alloy Products • Tax ID: 91330303679583678U             • Special Equipment Manufacturing License No.: TS2733T07–2029
Grade	Austenitic: TP304,TP304L,TP304H,TP316L,TP316Ti,TP317L,TP321,TP321H,TP347H,TP309S,TP310S Ferritic/Austenitic (Duplex Stainless) : S31803,S32205,S32750
Standard	ASTM A213 / ASME SA213 ASTM A789 / ASME SA789 ASTM A688 EN 10216-5 GOST 9941, GB/T13296
Dimension Range	Outer Diameter (OD): 6.0 mm ~ 114.3 mm (1/4" ~ 4")
	Wall Thickness (WT): 0.5 mm ~ 5.0 mm; available in BWG / SCH schedule
	Straight leg length: Customized up to maximum 30 m
Delivery Condition	Bright Annealed (BA) / Annealed & Pickled Addition Heat Treatment: Stress Relieved After U - Bending (Bending Area Plus 300MM For Each Leg.)
Min Bending Radius	See minimum bending radius table for applicable specifications
Strict Inspection & Test (100% available)	1.PMI Positive Material Identification 2.Visual & dimensional inspection 3.Flattening Test, Flaring Test, Tensile & Hardness Test 2.High Pressure hydrostatic Test: Minimum: 10 Mpa - - 25Mpa 2.Air Under Water Test After Bending 4.Eddy current test before U bend formed (additional) 5.Ultrasonic test before U bend formed (additional) 6.Heat Treatment to stress relieved (additional) 7.Ball passing Test (additional)
Pipe's Markings	GH-STEEL SML ASTM A213 TP304 25.4*2.11*L MM  HEAT/LOT NO.:****
Lead Time	• Stock items: 7 working days from order confirmation. • Made-to-order products: 30 calendar days from receipt of confirmed order and technical specifications.
Core Advantages	• Stress-relief annealing post-bending prevents cracking during thermal cycling   • Low ovality in bent sections ensures optimal heat transfer efficiency   • Excellent resistance to corrosion by acids, alkalis, steam, and seawater   • Stable performance under high-temperature and high-pressure conditions   • Customizable bending radius, length, and quantity   • Full traceability via heat number marking

1. Common Outer Diameter & Standard Wall Thickness (Metric / BWG)
Outer Diameter OD(mm)	Regular Wall Thickness WT(mm)	Corresponding BWG	Main Application Industries
10	1.0/1.2/1.5	22/20/18	Small refrigeration, precision pharmaceutical, small kettle internal coils
14	1.2/1.5/2.0	20/18/16	Central air conditioning, small hot water units, food sterilization
19	1.5/2.0/2.5	18/16/14	Small chemical heat exchangers, lithium battery temperature control, HVAC chillers
25.4 (1 inch)	1.65/2.11/2.77	16/14/12	Power plant high & low pressure heaters, seawater desalination, petrochemical (most universal)
32	2.0/2.5/3.0	14/12/10	Oil refining, waste heat recovery, large chemical plants
38.1	2.11/2.77/3.05	14/12/10	Thermal power condensers, offshore platform coolers
45	2.5/3.0/3.5	12/10/9	Large coal chemical industry, geothermal heat exchange equipment
50.8	2.77/3.40	12/10	Boiler waste heat recovery, high-pressure process heat exchangers
2.Standard Bend Radius Comparison Table (Centerline Radius) D = Tube Outer Diameter, R=2D is industry standard; R=1.5D is minimum limit radius
OD(mm)	Standard R=2D(mm)	Limit R=1.5D(mm)	Operation Instructions
10	20	15	Only TP304 available for 1.5D, stress relief annealing required after bending
14	28	21	Prioritize R=2D for general heat exchange
19	38	28.5	Thin-wall tubes not recommended for R=1.5D
25.4	50.8	38.1	Main specification for chemical & power plants
32	64	48	Select R≥2.5D for thick-wall high-pressure service
38.1	76.2	57.15	R≥2D is recommended for large diameter tubes
45	90	67.5	Duplex steel forbidden for cold bending at R=1.5D
50.8	101.6	76.2	R≥3D is preferred
Radius Selection Rules 1. R=2D: Mass production standard, wall thinning ≤10%, lowest cost, recommended by HG/T2650 2. R=2.5D~3D: For seawater, high pressure, high temperature & duplex steel; low residual stress, good resistance to chloride stress corrosion 3. R=1.5D: Custom for limited installation space; thicker tube wall + full-length heat treatment mandatory, not suitable for duplex steel
3.Material Grade Selection & Applicable Working Conditions
Material Grade	Applicable Scenarios		Prohibited Service Conditions
TP304 / TP304L	Fresh water, central air conditioning, normal-temperature food processing, clean water heat exchange		Seawater, high-temperature chloride medium, acidic brine
TP316 / TP316L	Pharmaceutical production, food disinfection, pool water, mild brine, weak acid chemical process		High-temperature concentrated seawater, long-term exposure to high-concentration chloride solution
TP321 / TP321H	Thermal power plant, high-temperature steam (450℃~550℃), intergranular corrosion resistance		High chloride aqueous environment
S32205 (2205 Duplex)	Seawater desalination, offshore platforms, medium-temperature brine, acidic salt chemical media		Long-term oxidation above 500℃
S32750 (2507 Duplex)	High-concentration seawater, high-temperature brine, heavy-corrosion chemical units		Sustained ultra-high temperature oxidation environment
4.Complete Purchase Description Template
Example : General Power Plant Application Stainless Steel Seamless U-Tube TP321, OD25.4×2.11, Centerline Bend Radius R=50.8mm, Straight Leg Length 2200mm per side, Stress Relief Annealing After Bending, Compliant with ASTM A213 & HG/T2650, Eddy Current + Hydrostatic Test Required.
5.Applications
Stainless steel U-bend tubes are used in heat exchangers (e.g., shell-and-tube), waste heat recovery units, and high-temperature fluid systems—across petrochemical, power, food, and pharmaceutical industries. Their corrosion resistance, high-temperature strength, and thermal compensation capability make them ideal for demanding conditions (e.g., high pressure, corrosive media), absorbing pipeline thermal expansion and extending equipment life.

6.Minimum bending radius table for applicable specifications.
Outside Diameter		Wall Thickness
		inch	0.035	0.039	0.049	0.059	0.065	0.079	0.083
		mm	0.89	1.1	1.24	1.5	1.65	2	2.11
		BWG	20	-	18	-	16	-	14
inch	mm	-	-	-	-	-	-	-	-
0.625	15.9	-	40	32	24	24	24	32	-
0.63	16	-	40	32	24	24	24	32	-
0.75	19.05	-	-	38	28.5	28.5	28.5	28.5	28.5
0.787	20	-	-	40	30	30.3	30	30	30.5
0.839	21.3	-	-	-	42.5	32	32	32	32
0.984	25	-	-	-	-	50	38	38	38
1	25.4	-	-	-	-	51	38	38	38
1.181	30	-	-	-	-	60	45	45	45
1.252	31.8	-	-	-	-	65	48	48	48
7.Stainless Steel U-Tube Linear Mass Table (kg/m)
Outside Diameter		Birmingham wire Gauge Conversion from BWG to mm
		20 BWG	19 BWG	18 BWG	17 BWG	16 BWG	14 BWG	12 BWG	10 BWG
mm	inch	0.89 mm	1.07 mm	1.24 mm	1.47 mm	1.65 mm	2.11 mm	2.77 mm	3.4 mm
6.35	1/4	0.121	0.141	0.158	0.179	0.193	-	-	-
9.53	3/8	0.192	0.225	0.256	0.295	0.324	0.39	0.466	-
12.7	1/2	0.262	0.31	0.354	0.411	0.454	0.557	0.685	0.788
15.88	5/8	0.332	0.395	0.452	0.528	0.585	0.724	0.905	1.057
19.05	3/4	0.403	0.479	0.55	0.644	0.715	0.89	1.123	1.325
25.4	1	0.543	0.648	0.746	0.876	0.976	1.224	1.561	1.863
31.75	1 1/4	0.684	0.818	0.942	1.109	1.237	1.558	2	2.401
38.1	1 1/2	-	0.987	1.139	1.341	1.498	1.892	2.438	2.939
44.5	1 3/4	-	1.158	1.336	1.576	1.761	2.228	2.879	3.481
50.8	2	-	1.325	1.531	1.806	2.02	2.559	3.314	4.014
63.5	2 1/2	-	-	-	2.271	2.542	3.227	4.19	5.09
76.2	3	-	-	-	-	3.064	3.894	5.067	6.166
88.9	3 1/2	-	-	-	-	3.586	4.562	5.943	7.241
101.6	4	-	-	-	-	4.108	5.229	6.819	8.317
114.3	4 1/2	-	-	-	-	-	5.897	7.696	9.393

8.Applicable Standards and Dimensional Tolerances for Stainless Steel Seamless  U Tubes
Standard	Outside Diameter Tolerance(mm)		Thickness Tolerance				Length Tolerance (mm)
ASTM A213	D<25.4	±0.1	D≤38.1		T:+20%/-0%		D≤50.80,L:+3/-0 D>50.8,L:+5/-0
	25.4≤D≤38.1	±0.15
	38.1<D≤50.8	±0.2	D>38.1		T:+22%/-0%
	50.8<D≤63.5	±0.25
	63.5<D≤76.2	±0.30
	76.2<D≤101.6	±0.38
	101.6<D≤190.5	+0.38/-0.64
	190.5<D≤228.6	+0.38/-1.14
ASTM A789	D<12.7	±0.13	T:±15%				L:+3.2/-0 L:+4.8/-0
	12.7<D≤38.1	±0.13	T:±10%
	38.1<D≤88.9	±0.25
	88.9<D≤139.7	±0.38
	139.7<D≤203.2	±0.76
EN10216-5	D3	±0.75%/±0.30	T3		T:±10%/ ±0.20mm		L≤6m,+5/-0 6<L≤12m,+10/-0
	D4	±0.5%/±0.10	T4		T:±7.5% / ±0.15mm
GOST 9941-2022 (except 06XH28MAT)	D<10	Normal:±0.30 High:±0.20 Higher:±0.15	T<0.3		Normal:±0.05 mm High:±0.03 mm		L:+15/-0
	10<D≤30	Normal:±0.40 High:±0.30 Higher:±0.20	0.3<T≤0.4		Normal:±0.07 mm High:±0.05 mm
	30<D≤95	Normal:±1.2% High:±1% Higher:±0.8%	0.4<T≤0.6		Normal:±0.10 mm High:±0.07 mm
			0.6<T≤1.0		Normal:±0.15 mm High:±0.10 mm
	D>95   D/S<40	Normal:±1.2% High:±1% Higher:±0.8%	1<T≤3 D/S<40		Normal:+12.5%/-15% High:+12.5%/-10% Higher:±10%
			3<T≤7 D/S >40		Normal:+12.5%/-15% High:±12.5%
	D>95   D/S >40	Normal:±1.5% High:±1.2% Higher:±1.0%	T>7 D<325		Normal:+12.5%/-10% High:±10%
			T>7 D>325		Normal:+12.5%/-15% High:±12.5%

Packing & Delivery

Company Profile

WENZHOU GUOHAO STEEL CO.,LTD

Wenzhou Guohao Steel Co., Ltd. is a Chinese manufacturer of high-performance stainless steel seamless pipes for construction, petrochemical, and offshore engineering.

We source raw materials from Tsingshan and Yongxing, and control the full production process—from cold rolling and solution annealing to fully automated eddy current and ultrasonic NDT—ensuring compliance with GB/T 14976, ASTM A312, GOST 9941 and EN 10216-5 on tensile strength, yield strength, elongation, dimensional tolerance, intergranular corrosion resistance, and uniform corrosion resistance.

We produce seamless tubes in austenitic (e.g., 304, 316L, 321, 310S), duplex (e.g., S32205, S32750), and nickel-based (e.g., Inconel 625, Hastelloy C-276, KhN78T) grades. All products are manufactured according to customer specifications, including outer diameter (OD), wall thickness, length, surface roughness, end finish, and packaging. Certificates of conformity are issued in accordance with EN 10204 Type 3.1 or 3.2, and third-party pre-shipment inspections are conducted by IAF-accredited bodies such as SGS or Bureau Veritas (BV).

FAQ

1.Q: Do you offer customized product services?

A: We manufacture products to your specifications and drawings, including custom dimensions, controls, and OEM orders.

2.Q: Are you a manufacturer or trader?

A: We are manufacturers. We have our own factory to produce and process various kinds of stainless steel /nickel alloy pipes.

3.Q: Can we get some samples? Is there a charge?

A: Yes, we will provide you with the samples you want. The samples are free of charge, but the customer may have to pay the freight..

4.Q: Can we visit your factory?  

A: Of course, we welcome you to visit our factory on-site or visit our production line through online videos to learn more about our strength and quality. Once we have your schedule, we will arrange a professional sales team to follow up with you.

5.Q: How do you ensure the quality of the product?  

A: Our company's stainless steel pipe products are subject to full-process inspection in strict accordance with the enterprise quality manual. The factory inspection report is provided with the goods. If necessary, third-party inspections such as SGS can be accepted.

6.Q: What is your delivery time? 

A: Different products and procurement quantities have different delivery times. The product will be delivered as soon as possible on the basis of quality assurance. Usually, if the goods are in stock, it takes 3-10 days. Alternatively, if the goods are out of stock, it will take 25 to 45 days

7.Q: Can you arrange shipment?  

A: Of course, we have freight forwarders who have been cooperating for many years.

8.Q: What if I don't have import experience?  

A: We handle all import logistics for first-time buyers. With a valid import license, we manage documentation (commercial invoice, packing list, bill of lading), customs classification, freight forwarding, and delivery—ensuring secure, on-time, and compliant shipment.

9.Q: Do you have an export license for steel products?

· A: We are a factory and can directly apply for export licenses for steel products and export them in compliance with regulations.

10.Q: Do you have a VTB account?

· A: We hold a VTB Bank account, reducing cross-border collection fees and export-related costs.