AISI ASTM TP 304 304L 309S 310S 316L 316ti 321 347H 317L 904L 2205
2507 Inox Stainless Steel Seamless Tube
What is stainless steel
Stainless steel is an alloy of Iron with a minimum of 10.5%
Chromium. Chromium produces a thin layer of oxide on the surface of
the steel known as the passive layer. This prevents any further
corrosion of the surface. Increasing the amount of Chromium gives
an increased resistance to corrosion.
Stainless steel also contains varying amounts of Carbon, Silicon
and Manganese. Other elements such as Nickel and Molybdenum may be
added to impart other useful properties such as enhanced
formability and increased corrosion resistance.
Grade | C | Si | Mn | P | S | Ni | Cr | Mo |
201 | ≤0.15 | ≤0.75 | 5.5-7.5 | ≤0.06 | ≤ 0.03 | 3.5-5.5 | 16.0-18.0 | - |
301 | ≤0.15 | ≤1.0 | ≤2.0 | ≤0.045 | ≤ 0.03 | 6.0-8.0 | 16.0-18.0 | - |
304 | ≤0.08 | ≤1.0 | ≤2.0 | ≤0.045 | ≤ 0.03 | 8.0-10.5 | 18.0-20.0 | - |
304L | ≤0.03 | ≤1.0 | ≤2.0 | ≤0.035 | ≤ 0.03 | 9.0-13.0 | 18.0-20.0 | - |
316 | ≤0.08 | ≤1.0 | ≤2.0 | ≤0.045 | ≤ 0.03 | 10.0-14.0 | 16.0-18.0 | 2.0-3.0 |
316L | ≤0.03 | ≤1.0 | ≤2.0 | ≤0.045 | ≤ 0.03 | 12.0-15.0 | 16 .0-1 8.0 | 2.0-3.0 |
321 | ≤0.08 | ≤1.0 | ≤2.0 | ≤0.035 | ≤ 0.03 | 9.013 | 17.0-1 9.0 | - |
410 | ≤0.15 | ≤1.0 | ≤1.0 | ≤0.035 | ≤ 0.03 | - | 11.5-13.5 | - |
430 | ≤0.12 | ≤0.75 | ≤1.0 | ≤0.040 | ≤ 0.03 | ≤0.60 | 16.0-18.0 | - |
Knowing that distinction can also help in determining which tubing
is best for a given application, welded or seamless. The method of
manufacturing welded and seamless tubing is evident in their names
alone. Seamless tubes are as defined – they do not have a welded
seam. The tubing is manufactured through an extrusion process where
the tube is drawn from a solid stainless steel billet and extruded
into a hollow form. The billets are first heated and then formed
into oblong circular molds that are hollowed in a piercing mill.
While hot, the molds are drawn through a mandrel rod and elongated.
The mandrel milling process increases the molds length by twenty
times to form a seamless tube shape. Tubing is further shaped
through pilgering, a cold rolling process, or cold drawing.
Welded Tubing Manufacturing
A welded stainless steel tube is produced through roll forming
strips or sheets of stainless steel into a tube shape and then
welding the seam longitudinally. Welded tubing can be accomplished
either by hot forming and cold forming processes. Of the two, cold
forming results in smoother finishes and tighter tolerances.
However, each method creates a durable, strong, steel tube that
resists corrosion. The seam can be left beaded or it can be further
worked by cold rolling and forging methods. The welded tube can
also be drawn similar to seamless tubing to produce a finer weld
seam with better surface finishes and tighter tolerances.
Choosing Between Welded and Seamless
There are benefits and drawbacks in choosing welded vs. seamless
tubing.
Seamless Tubing
By definition seamless tubes are completely homogenous tubes, the
properties of which give seamless tubing more strength, superior
corrosion resistance, and the ability to withstand higher pressure
than welded tubes. This makes them more suitable in critical
applications in harsh environments, but it comes with a price.
Benefits
- Stronger
- Superior corrosion resistance
- Higher pressure resistance
Applications
- Oil and gas control lines
- Chemical injection lines
- Below sea safety valves
- Chemical processing plant steam and heat trace bundles
- Fluid and gas transfer
Welded Tubing
Welded tubing is generally less expensive than seamless tubing due
to the simpler manufacturing process in creating welded tubing. It
is also readily available, like seamless tubing, in long continuous
lengths. Standard sizes can be produced with similar lead times for
both welded and seamless tubing. Seamless tubing costs can be
offset in smaller manufacturing runs if less quantity is required.
Otherwise, though custom sized seamless tubing can be produced and
delivered more quickly, it is more costly.
Benefits
- Cost-efficient
- Readily available in long lengths
- Fast lead times
Applications
- Architectural applications
- Hypodermic needles
- Automotive industry
- Food and beverage industry
- Marine industry
- Pharmaceutical industry
Stainless Steel Pipes Parameter
Product Name | Stainless Steel Pipe/Tube |
Technology | Hot Rolled Industrial Stainless Steel Tube
Cold Rolled Decorative Stainless Steel Pipe |
Material | 201, 202, 301, 302, 304, 304L, 310S, 316, 316L, 321, 430, 430A,
309S, 2205, 2507, 2520, 430 , 410, 440, 904Lect, Or Customized |
Thickness | 0.4-50 mm |
Length | 1-12 m |
Outer Diameter(OD) | 10-2000mm |
Standard | ASTM, JIS, GB, AISI, DIN, BS,EN |
Certifications | ISO 9001 BV SGS |
Packing | Industry standard packaging or according to client's requirement |
Brand | TISCO,ZPSS,Baosteel,POSCO,LISCO,YUSCO,Ansteel, QPSS,JISCO,HXSCO,
Chengde,Yongjin,Tsingshan,Shouyang,HW |
Payment terms | 30%T/T in advance, the balance against the B/L copy |
Delivery time | Fast delievery in 7 days,up to order quantity |
Warehose Stcok | 5000 tons per month |
