ASTM A269 TP304 / 304L Stainless Steel Coil Tubing

GNEE, as a professional supplier of stainless steel coil tubing, provides both seamless and welded coil tubing with full-size customization options. We maintain 500 tons of regular stock and offer fast delivery within 7 days. Each batch is supplied with EN 10204 3.1 Mill Test Certificates and 100% UT/ET non-destructive testing reports, making our products widely suitable for heat exchange systems, oil & gas control lines, and high-purity fluid transportation in food and pharmaceutical industries.

 

TP304 stainless steel tubing contains 18% Cr and 8% Ni, offering excellent resistance to atmospheric and mild acid/alkali corrosion, with short-term heat resistance up to 850°C and long-term stable service temperature up to 550°C. TP304L, with low carbon content (C≤0.03%), completely eliminates the risk of welding sensitization and intergranular corrosion, making it suitable for applications operating between 450–850°C.

 

The 304 stainless steel coil tubing we supply can reach a maximum continuous length of 1300 meters, minimizing the need for welded joints. Its continuous installation design significantly shortens construction time and reduces leakage risks. The surface is treated by pickling or bright annealing, achieving Ra≤0.8μm for a clean and easy-to-maintain finish. The small-diameter and thin-wall design improves heat transfer efficiency, making it widely used in refrigeration units, HVAC systems, industrial coolers, and related equipment.

 

304 Stainless Steel Coiled Tubes Specification

Product Name	Seamless Stainless Steel Coiled Tubes
Material	TP304 ,TP304L ,TP316L
Standard	ASTM A269
Specification	Outer diameter	3/16" - 1 1/4" (4.76-31.8mm)
	Wall thickness	0.028"-0.083" (0.7mm-2.11mm)
	Length	1:According to the different outer diameter and wall thickness, the weight of one coil of seamless coiled tubes is about 80kg-100kg. 2:Please Note:The longer the length of seamless coiled tubes, the more expensive the price Is. The most economical price is that the weight of single coil is less than 28kg. 3:According to the required outer diameter and wall thickness, the length of stainless steel seamless coiled tubes is converted by the theoretical calculation formula of stainless steel tube. 4:Solemnly Note:There is no welding point in the whole coils of seamless coiled tubes. 5:According to the demand, multi coils stainless steel seamless coiled tubes can also be used to form super long stainless steel coil tubes of several thousand meters by butt welding.
Surface	Bright Annealing
Markings	As Customer's Requirement.
Hydrostatic or Nondestructive Testing	Each pipe shall be subjected to the nondestructive electric test or the hydrostatic test
Delivery Time	1.for ready stock :7 days after receiving the deposit of T/T 2.For MTO: 35 days after receiving the deposit of T/T
Trade Terms	EXW,FOB, CFR, CIF etc.
Loading Port	Ningbo/Wenzhou/Shanghai
Remittance method	TT/LC/CASH

 

Composition Composition of 304 Stainless Steel

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
304	min. max.	- 0.08	- 2.0	- 0.75	- 0.045	- 0.030	18.0 20.0	-	8.0 10.5	- 0.10
304L	min. max.	- 0.030	- 2.0	- 0.75	- 0.045	- 0.030	18.0 20.0	-	8.0 12.0	- 0.10
304H	min. max.	0.04 0.10	- 2.0	- 0.75	-0.045	- 0.030	18.0 20.0	-	8.0 10.5	-

 

Mechanical Properties of 304 Stainless Steel

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50 mm) min	Hardness
Rockwell B (HR B) max	Brinell (HB) max
304	515	205	40	92
304L	485	170	40	92
304H	515	205	40	92

 

Weight per Meter (kg/m) of 304 Stainless Steel Seamless Coiled Tubes

Outside Diameter		Birmingham wire Gauge Conversion from BWG to mm
		22 BWG	20 BWG	18 BWG	16 BWG	14 BWG	12 BWG	10 BWG
mm	inch	0.71mm	0.89 mm	1.24 mm	1.65 mm	2.11 mm	2.77 mm	3.4 mm
6.35	1/4"	0.1	0.121	0.158	0.193	–	–	–
9.53	3/8"	0.156	0.192	0.256	0.324	0.39	0.466	–
12.7	1/2"	0.212	0.262	0.354	0.454	0.557	0.685	0.788
15.88	5/8"	0.268	0.332	0.452	0.585	0.724	0.905	1.057
19.05	3/4"	0.324	0.403	0.55	0.715	0.89	1.123	1.325
25.4	1"	–	0.543	0.746	0.976	1.224	1.561	1.863
31.75	1 1/4"	–	0.684	0.942	1.237	1.558	2	2.401
38.1	1 1/2"	–	–	1.139	1.498	1.892	2.438	2.939
44.5	1 3/4"	–	–	1.336	1.761	2.228	2.879	3.481
50.8	2"	–	–	1.531	2.02	2.559	3.314	4.014
63.5	2 1/2"	–	–	–	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

 

Application Areas

Heat Exchange Systems: Used in heating/cooling coils in refrigeration units, HVAC systems, and industrial coolers.

Food and Pharmaceuticals: Suitable for dairy, beverage, and aseptic filling lines.

Chemicals and Energy: Used in reaction vessels, boilers, and flue gas treatment equipment.

Instrumentation and Control: Used as precision conduits in pneumatic and hydraulic systems.

 

ASTM A269 TP304/304L Stainless Steel Coil Tubing Price

Bulk/Wholesale (metric tonnes): US$1,000 to US$5,000 per metric tonne, depending on the global nickel surcharge and whether the tubing is seamless or welded.

Pre-cut/Retail Coils: Prices range from US$130 to US$340 for small-scale purchases (e.g., 25-foot coils for DIY or fluid transport).

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High-quality sea freight packaging

304 stainless steel tubing is typically delivered in 3-10 days for in-stock items, and approximately 30-50 days for bulk orders. Packaging uses plywood reels or plastic cores, with single rolls ranging from 500 to 2000 meters in length to minimize on-site welding points. The inner layer is waterproofed and fitted with protective end caps, while the outer layer is sealed in a fumigation-free wooden crate, ensuring that the extra-long tubing remains free from compression, scratches, rust, and contamination during transoceanic transport.

 

FAQ 

Q: Why choose coiled tubing instead of straight tubing?

A: The biggest advantage of coiled tubing is the reduction of weld points. Single coil lengths can reach hundreds or even thousands of meters, significantly reducing the number of joints and welds during installation, thereby reducing the risk of system leaks, saving labor installation costs, and shortening the construction period.

 

Q: What is the difference between TP304 and TP304L?

A: The main difference is the carbon content. TP304L (low carbon) has a carbon content controlled below 0.03%, while TP304 is below 0.08%. This low carbon content allows it to maintain excellent resistance to intergranular corrosion without heat treatment after welding, making it more suitable for applications requiring extensive on-site welding.

 

Q: What surface finishes are typically offered for ASTM A269 coiled tubing?

A: The most common is Bright Annealed (BA). Because the coil is in a protective gas environment in the annealing furnace, the inner and outer walls are extremely bright, clean, and free of oxide layers, making it ideal for instrumentation systems requiring high fluid purity.