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Stainless Pipes and tubes
Stainless Pipes and tubes are made from more than 20 steel grades of various corrosion resistance and are intended for application in conditions of a wide range of corrosion environments and temperatures in heat exchanger.
There are different types of stainless steels: when nickel, for instance is added the austenite structure of iron is stabilized.
Types of stainless steel
There are different types of stainless steels: when nickel, for instance is added the austenite structure of iron is stabilized.
What is stainless steel?This crystal structure makes such steels non-magnetic and less brittle at low temperatures. For higher hardness and strength, carbon is added. When subjected to adequate heat treatment these steels are used as razor blades, cutlery, tools etc.
Significant quantities of manganese have been used in many stainless steel compositions. Manganese preserves an austenitic structure in the steel as does nickel, but at a lower cost.
Austenitic stainless steels comprise over 70% of total stainless steel production. They contain a maximum of 0.15% carbon, a minimum of 16% chromium and sufficient nickel and/or manganese to retain an austenitic structure at all temperatures from the cryogenic region to the melting point of the alloy. A typical composition is 18% chromium and 10% nickel, commonly known as 18/10 stainless is often used in flatware. Similarly 18/0 and 18/8 is also available. ¨Superaustenitic〃 stainless steels, such as alloy AL-6XN and 254SMO, exhibit great resistance to chloride pitting and crevice corrosion due to high Molybdenum contents (>6%) and nitrogen additions and the higher nickel content ensures better resistance to stress-corrosion cracking over the 300 series. The higher alloy content of "Superaustenitic" steels means they are fearsomely expensive and similar performance can usually be achieved using duplex steels at much lower cost.
Ferritic stainless steels are highly corrosion resistant, but far lessdurable than austenitic grades and cannot be hardened by heat treatment. They contain between 10.5% and 27% chromium and very little nickel, if any. Most compositions include molybdenum; some, aluminium or titanium. Common ferritic grades include 18Cr-2Mo, 26Cr-1Mo, 29Cr-4Mo, and 29Cr-4Mo-2Ni.
Martensitic stainless steels are not as corrosion resistant as the other two classes, but are extremely strong and tough as well as highly machineable, and can be hardened by heat treatment. Martensitic stainless steel contains chromium (12-14%), molybdenum (0.2-1%), no nickel, and about 0.1-1% carbon (giving it more hardness but making the material a bit more brittle). It is quenched and magnetic. It is also known as "series-00" steel.
Duplex stainless steels have a mixed microstructure of austenite and ferrite, the aim being to produce a 50:50 mix although in commercial alloys the mix may be 60:40. Duplex steel have improved strength over austenitic stainless steels and also improved resistance to localised corrosion particularly pitting, crevice corrosion and stress corrosion cracking. They are characterised by high chromium and lower nickel contents than austenitic stainless steels.
The AISI defines the following grades among others:200 Series austenitic iron-chromium-nickel-manganese alloys300 Series austenitic iron-chromium-nickel alloys
Type 301 highly ductile, for formed products. Also hardens rapidly during mechanical working.
Type 303 Free machining version of 304 via addition of sulfur
Type 304 the most common; the classic 18/8 stainless steel.
Type 316 the next most common; for food and surgical stainless steel uses; Alloy addition of molybdenum prevents specific forms of corrosion. Also known as "marine grade" stainless steel due to its increased ability to resist saltwater corrosion compared to type 304. SS316 is often used for building nuclear reprocessing plants.
Type 408 heat-resistant; poor corrosion resistance; 11% chromium, 8% nickel.
Type 409 cheapest type; used for automobile exhausts; ferritic (iron/chromium only).
Type 410 martensitic (high-strength iron/chromium).
Type 420 "Cutlery Grade" martensitic; similar to the Brearley's original "rustless steel". Also known as "surgical steel".
Type 430 decorative, e.g. for automotive trim; ferritic.
Type 440 a higher grade of cutlery steel, with more carbon in it, which allows for much better edge retention when the steel is heat treated properly.
Type 630 most common PH stainless, better known as 17-4; 17% chromium, 4% nickel
History of stainless steel
The material we know as stainless steel (also commonly referred to as "Inox" or "Rostfrei") is such a common feature of 21st century living that there can be few of us who have not seen or handled articles made from it. But how many of us really know what stainless steel is?
Heat resisting stainless steel pipe
The auction is for 6 metre length of prime quality grade 409 stainless steel tubing with a 1.2mm wall thickness x 38.1mm (1 1/2") diameter.
Stainless steel tube
Stainless steel tube is typically measured by its outer diameter and can be used in a variety of applications including a number of structural applications.
Stainless Steel Pipes
Stainless Steel Seamless Pipes is a hollow steel bar, a large number of pipes used for conveying fluids, such as oil, gas, water, gas, steam,heat exchanger,mechanical machine.
Bright annealing tube
Bright annealing tube under a reducing atmosphere or in a vacuum protection, after high temperature solid melting and rapid cooling to get the stainless steel tube...
Stainless steel tube for heat exchanger
Duplex Stainless Steel Pipe
While Duplex 2205 is the most common duplex product we supply, we can also deliver Duplex 2304 and Duplex 2207 with reduced lead times as these alloys are stocked.
U-bend or U-shape tubes
ASTM A556M-88 Seamless cold drawn steel feedwater heater tubes 1
U-tube Usage: Boilers, heat exchangers, super heaters, condensers
Stainless steel pipes for oil cracking
Manufactuer of Stainless steel pipes for oil cracking
Stainless steel oval pipe
Stainless steel oval tube offered in grades 304 and 316 in a wide choice of sizes. All to order, with a large range on the shelf.
Stainless Steel Square / Rectangular Tubes
Material: 304/L/H, 316/L/H/TI, 321/H, 347/H, 317/LM/LMN, 309S/H, 310S/H,SAF2205 (S31803), SAF2507 (S32750), 904L.
ANSI Standards Stainless Steel Pipe Specs
Stainless steel pipe is one of the more standardized materials in the building and engineering industries.
Welcome to Sunny Steel Enterprise Ltd.
Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.You can get in touch by telephone, post, online or E-mail.
Please check the help section first to see if your question may be answered there.
Tel.: +8621 3378 0199
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