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304 Square Stainless Steel Tubing Seamless, stainless steel square tube
Products Details
Duplex 2205 is a two-phase, ferritic, austenitic 22% chromium, 3%
molybdenum, 5 to 6% nickel alloyed stainless steel. It is the most
widely used duplex stainless steel grade and is characterized by
high yield strength, double that of the standard austenitic
stainless steel grades. It also demonstrates good fatigue strength,
as well as outstanding resistance to stress corrosion cracking,
crevice, pitting, erosion, and general corrosion in severe
environments.
| Name | 304 Square Stainless Steel Tubing Seamless, stainless steel square tube | |||
| Items | ROUND SS SMLS PIPE | |||
| Standard | ASTM ,GB,DIN AISI | |||
| Material Grade | 201: Ni 0.7%--1% | |||
| 304: Ni 8%, Cr 18% | ||||
| 316L:Ni10%,Cr16% | ||||
| Outer Diameter | Round pipe9.5mm--813mm | |||
| Thickness | 0.8mm - 34mm | |||
| Length | 5.8m,6m, or as customers' request | |||
| Tolerance | a) Outer Diameter: +/- 0.2mm | |||
| b) Thickness: +/- 0.02mm | ||||
| c) Length: +/- 5mm | ||||
| Surface | annealing,pickling | |||
| sandblasting | ||||
| Application | industry,exhausting,water | |||
| Test | Squash test, extended test, water pressure test,heat treatment, NDT | |||
| Chemical Composition of Material | Material | 201 | 316L | 304 |
| C | ≤0.15 | ≤0.035 | ≤0.08 | |
| Si | ≤1.00 | ≤1.00 | ≤1.00 | |
| Mn | 5.5-7.5 | 2 | ≤2.00 | |
| P | ≤0.06 | ≤0.045 | ≤0.045 | |
| S | ≤0.03 | ≤0.03 | ≤0.03 | |
| Cr | 16-18 | 16-18 | 18-20 | |
| Ni | 3.5-5.5 | 10-14 | 8-11 | |
| Mechanical Property | Material Item | 201 | 202 | |
| Tensile Strength | ≥535 | ≥520 | ||
| Yield Strength | ≥245 | ≥205 | ||
| Extension | ≥30% | ≥30% | ||
| Hardness (HV) | <253 | <253 | ||
Welding Characteristics
A. Possesses good weldability
B. Should not generally be welded without filler metal as this may
result in excessive ferrite
Heat-Treatment
A. Annealing temperature range is 1868 to 2012°F (1020 to 1100°C)
B. Cannot be hardened by heat treatment – but Duplex 2205 does
work-harden
C.Special consideration is needed to compensate for a higher
coefficient of thermal expansion to avoid warping and distortion
Process -hot forming
Most Duplex 2205 producers recommend a maximum hot forming
temperature between 2010 and 2100°F (1100 to 1150°C). If the shape
of the work piece is not compact, the edges may be significantly
cooler than the bulk, and there is risk of cracking in the cooler
regions.
Process -Cold Forming
Duplex 2205 has shown good formability in a variety of
fabrications. The high strength of Duplex 2205 can pose problems.
Even when the equipment has sufficient power, allowance must be
made for higher spring-back caused by the grade’s high strength.
Machinability
Duplex 2205 is somewhat more difficult to machine than the 300
series austenitic stainless steels. Higher cutting forces are
required and more rapid tool wear is typical. Some guidelines for
machining are: A) Use powerful, rigid machines with extremely
strong rigid mounting of tools and work piece, B) Minimize
vibration by keeping the tool extension as short as possible, C)
Use a nose radius on the tool, no longer than necessary, for
carbides that have a sharp edge while still providing adequate
strength, D) Design machining sequences to always provide for a
depth of cut below the work hardened layer resulting from the
previous passes.
