Stainless Steel pipe (Stainless Steel) is a hollow strip of
cylindrical Steel, his scope of application as the pipeline of
fluid transport, mainly widely used in petroleum, chemical,
medical, food, light industry, mechanical instrumentation and other
industrial pipelines and mechanical structural components.
Stainless steel pipes are made of acid and heat resistant billets,
heated, perforated, sized, hot rolled and cut.
Classification of stainless steel pipe: stainless steel seamless
steel pipe and stainless steel welded steel pipe (seam steel pipe)
basic two categories. According to the outer diameter shape of
steel tube can be divided into round tube and special-shaped tube,
what is widely used is circular steel tube, but also have a few
square, rectangle, semicircle, hexagonal, equilateral triangle,
octagonal special-shaped steel tube.
For the steel pipe under fluid pressure to carry out hydraulic test
and ray flaw detection to test its pressure ability and quality,
under the specified pressure does not leak, wet or expansion for
qualified, some steel pipe according to the standard or the
requirements of the side test, flaring test, flattening test.
Specification:
A:Stainless steel seamless pipe:
Standard:ASTM A312 Austenitic Stainless Steel Pipes for
high-temperature and general corrosive service.
ASTM A213 for Seamless Ferritic and Austenitic Alloy-Steel Boiler,
Superheater, and Heat-Exchanger Tubes
ASTM A269 Austenitic Stainless Steel Tubes for General Service
ASTM A270 for Austenitic and Ferritic/Austenitic Stainless Steel
Sanitary Tubes
Grade:
TP304,TP304L,TP304H,TP316,TP316L,TP316Ti,TP309,TP310S,TP321,TP321H,
TP347, TP347H, TP405, TP410, TP430
Sizes: 1/8" - 36" +
Schedules: S/5s - XXS
Services: Bending - Cutting - Grooving - Polishing - Threading
Surface treatment: Industrial tubes Annealed and pickled, Sanitary
tubes polished 180 grit, 240 grit, 400 grit
Austenitic steel
| TP304 | General-purpose stainless steel with good corrosion resistance for
most applications. Used for: Bar rails, Boat
railings, Canopy supports, Chemical processing equipment, Chemical
tubing, Column covers, Duct works, Feed-water
tubes, Food preparation equipment, Food processing equipment, Heat
exchanger tubes, Hypodermic needles,
Ladders, Mechanical & structural components, Pharmaceutical
processing equipment, Piping systems, Railings
(architectural), Traffic barriers, Water pipes. |
| TP304H | Higher carbon content than 304L, for increased strength,
particularly at elevated temperatures. |
| TP304L | Chemical plant and food processing equipment, where freedom from
sensitization is required in plate thicknesses
TP316/316L |
| TP316/316L | Used where higher corrosion resistance is required. Boat railings,
Canopy supports, Chemical tubing, Column covers,
Duct works, Feed-water tubes, Food preparation equipment, Food
processing equipment, Heat exchanger tubes,
Hypodermic needles, Ladders, Mechanical & structural components,
Pharmaceutical processing equipment, Piping
systems, Railings, Street (urban) furniture, Textile tubing,
Traffic barriers, Water pipes. |
| TP316H | Similar oxidation resistance to TP 316. Main areas of application:
Heat exchangers, furnaces, chemical and
petrochemical plant. |
| TP321 | Heat exchanger tubing, Chemical processing tubing, Pressure tank
tubing. Suitable for heat resisting applications
to 800°C. |
| TP321H | This is the high carbon version of TP 321 which ensures greater
creep resistance. Behaves much the same as TP 321
in oxidation resistance. Main applications: Heat exchangers,
furnaces, boilers in chemical and petrochemical plant |
| TP316Ti | A titanium stabilized version of 316 used where good resistance to
intergranular corrosion and high temperature
strength is required. |
| TP317 | Chemical processing tubing, Dyeing equipment, Ink manufacturing
equipment, Pulp & paper manufacturing
equipment |
| TP347HFG | Mainly used for boilers in the termal power plant, reheaters and
superheaters |
Super-Austenitic steel
TP904L
High resistance to general corrosion in e.g. sulphuric and acetic
acids, crevice corrosion, stress corrosion cracking, pitting in
chloride bearing solutions.
Ferritic and Martensitic Steel
| TP405 | Used for applications where hardening upon cooling from high
temperatures must be avoided. Has excellent
long-time stability up to 1200°F. |
| TP410 | General purpose grade for use in mildly corrosive environments |
| TP430 | Mechanical & structural tubing, Architectural tubing, Heat
exchanger tubing, Condensers, Re-heaters, Evaporators. |
Duplex
| S31803 | Typically used in heat exchangers, gas scrubbers, fans, chemical
tanks, flowlines, marine and refinery applications. |
| S32750 | Used in oil & gas, chemical process, power industries. At that
heat-exchangers are main application. |
| S31254 | With high levels of chromium, molybdenum, and nitrogen is
especially suited for high-chloride environments such as brackish
water, seawater and other high-chloride process streams. |
Value-added services
BEVELING
Beveling Stainless Steel tubes contain one end angled, so that it
mates with a complementary tube end. Tubes can be beveled for
certain applications in order to make welding of stainless steel
tubes easier, which saves weld prep time and money compared to hand
cutting.
HEAT TREATING & ANNEALING
Permanent Steel can heat treat some 400 series stainless steel
seamless tube. Heat treating realizes stress as a result of
hardening, depending upon the chemistry of the metal being treated.
Heat treating is also used for tempering, quenching, normalizing,
and solution annealing.
HONING & TURNING
During the honing/turning process, an abrasive rotating tool
removes metal from the interior surface of a cylinder, pipe, or
tube. The main purpose of honing is to finish the surface to a
particular diameter and/or desired cylindrical geometric design.
Honing is typically a secondary machining operation that completes
a produce/part, relieves stress created during production, or
corrects features of the finished product. A typical production
cycle is to drill, ream, heat treat, then hone.
POLISHING
POSITIVE MATERIAL IDENTIFICATION (PMI)
In some cases, it may be necessary to complete additional positive
material identification testing. Permanent Steel can complete this
testing in house or we can work with an independent laboratory to
complete the testing. Please contact us for specific requirements.
UT TESTING
Ultrasonic Testing (UT) utilizes sound energy at high frequencies,
in order to provide examinations and measurements of the stainless
steel product. This aids in flaw detection/evaluation, dimensional
measurements, etc.
B:Stainless steel welded pipe:
Sizes & Schedule Specifications
Size Range: 2" - 48"
Schedules: 5S, 10S, STD, XS, 40, 80, 100, 120, 160, XXS
Products: Stainless steel welded pipe, stainless steel erw pipe,
stainless steel efw pipe
Grades of Stainless Steel Tube
Austenitic: 201, 304/304L, 316/316L, 317/317L, 347/347H, 321/321H,
904L
Ferritic: 409, 430, 439, 441, 434, 436, 444, 446
Martensitic: 403, 410, 410S, 414/L, 441, 418, 420, 440, 416
Duplex: 2205/S31803, S32750, S32760
Manufacturing process:
Stainless steel welded tube is a steel pipe made of steel plate or
strip steel that is crimped and formed by a unit and a mold. The
production process of welded steel pipe is simple, the production
efficiency is high, the variety and specification are many, and the
equipment investment is small, but the general strength is lower
than that of seamless steel pipe.
Processing for Stainless Steel Welded Pipe
| Bar & Structural Cutting | Products cut include Round Bar, Flat bar, Hex bar, Square bar,
Tubing and Hollow Bar, Pipe, Angles, channels, Beams and Tees. Thickness range is 1/16″ to
28″diameter |
| Production Cutting | Stainless can provide production cutting for product diameters up
to 4″. |
| Pipe Threading | Available thru 2″ in Diameter/All schedules |
| Tubular Polishing | Products polished included all tubular products, with OD & ID
polishing available, Round Bar, Square Bar, Hex & Flat bar, Angles, Uneven Leg Angles, beams, and
other shapes. |
Welded Stainless Steel Pipe Tolerances
| NPS Designator | Permissible Variations in Outside Diameter |
| Over In. | Under In. |
| 1/8 to 1-1/2, incl | 1/64 (0.015) | 1/32 (0.031) |
| Over 1-1/2 to 4, incl | 1/32 (0.031) | 1/32 (0.031) |
| Over 4 to 8, incl | 1/16 (0.062) | 1/32 (0.031) |
| Over 8 to 18, incl | 3/23 (0.093) | 1/32 (0.031) |
Nominal Wall Thickness:
| NPS Designator | Outside Diameter in. | Schedule 5S in. | Schedule 10S in. | Schedule 40S in. | Schedule 80S in. |
| 1/4 | 0.540 | | 0.065 | 0.088 | 0.119 |
| 3/8 | 0.675 | | 0.065 | 0.091 | 0.126 |
| 1/2 | 0.840 | 0.065 | 0.083 | 0.109 | 0.147 |
| 3/4 | 1.050 | 0.065 | 0.083 | 0.113 | 0.154 |
| 1.0 | 1.315 | 0.065 | 0.109 | 0.133 | 0.179 |
| 1 1/4 | 1.660 | 0.065 | 0.109 | 0.140 | 0.191 |
| 1 1/2 | 1.900 | 0.065 | 0.109 | 0.145 | 0.200 |
| 2 | 2.375 | 0.065 | 0.109 | 0.154 | 0.218 |
| 2 1/2 | 2.875 | 0.083 | 0.120 | 0.203 | 0.276 |
| 3 | 3.500 | 0.083 | 0.120 | 0.216 | 0.300 |
| 3 1/2 | 4.000 | 0.083 | 0.120 | 0.226 | 0.318 |
| 4 | 4.500 | 0.083 | 0.120 | 0.237 | 0.337 |
| 5 | 5.563 | 0.109 | 0.134 | 0.258 | 0.375 |
| 6 | 6.625 | 0.109 | 0.134 | 0.280 | 0.432 |
| 8 | 8.625 | 0.109 | 0.148 | 0.322 | 0.500 |
| 10 | 10.750 | 0.134 | 0.165 | 0.365 | 0.500 |
| 12 | 12.750 | 0.156 | 0.180 | 0.375 | 0.500 |
C:Stainless steel decorative pipe:
| ITEMS | Stainless steel decorative pipe |
| Stainless welded pipe(round) | Stainless square pipe | Stainless rectangle pipe | Stainless oval pipe |
OD range |
3-219MM |
10MM*10MM--100MM*100MM |
20*10MM--100*200MM | 5*48MM
38*15MM
39.8*20.8MM
44*16MM etc.. |
| WT range | 0.12-4MM | 0.16-4MM | 0.16-4MM | 0.23-4MM |
| Length range | Normal length 3-6M,but can be custom-made as requirements. |
| Grade | 304/301/201/202/316/430/410/420/409etc. |
| Surface treatment | Matte(usually used as industrial pipe)/Mirror finish(decoration
pipe) |
D:Stainless slotted tubes::
Johnson screen/ore screen mesh | Grade:201/202/205/304/316/321 etc...
Shape:Cylindric,flake
Cylinder Diameter:29-1000mm
Slot size:0.5-1.0mm in usual, can be customized
Filter type:from outside to inside
Length:2.9m or5.8m in usual to fit the container
End connection: Male/female threaded couplings, weld rings/plain
beveled |
Wire-wrapped screen/strainer | Grade:201/202/205/304/316/321 etc...
Size:2-16inch
Slot size:0.5-1.0mm in usual, can be customized
Length:2.9m or5.8m in usual to fit the container
End connection:Male/female threaded couplings, weld rings/plain
beveled |
