Categories | Stainless Steel Seamless Tube |
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Place of Origin: | China, India, USA, Korea, UE |
Brand Name: | XINHANG |
Certification: | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
MOQ: | 100KGS |
Price: | negotiable |
Packaging Details: | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
Delivery Time: | 10days-> |
Payment Terms: | T/T, L/C |
Supply Ability: | 1500 tons per month |
Company Info. |
Yuhong Group Co.,Ltd |
Verified Supplier |
View Contact Details |
Product List |
Stainless Steel Seamless Tube, A213, A269, EN10216-5, DIN 17459, JIS-G3459 , GOST9941
ASTM A / ASME SA 312 / 269 / 317L Stainless Steel Pipes SCH10 / 10S, SCH20, SCH30, SCH40/40S, STD, SCH80/80S, XS,
317L Stainless Steel Seamless Pipes and Tubes |
317L Stainless Steel Pipes and Tubes Product Range
317L Stainless Steel Pipes and Tubes Specifications: ASTM A/ASME SA
312/269/213/358 317L Stainless Steel Pipes and Tubes Sizes
(Seamless): 1/2" NB - 8" NB
317L Stainless Steel Pipes and Tubes Sizes (ERW): 1/2" NB - 24" NB
317L Stainless Steel Pipes and Tubes Sizes (EFW): 6" NB - 100" NB
317L Stainless Steel Pipes and Tubes Wall Thickness available:
Schedule 5S - Schedule XXS (heavier on request)
317L Stainless Steel Pipes and Tubes Other Materials Testing:
NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc.
317L Stainless Steel Pipes and Tubes Dimensions:
All Pipes is manufactured and inspected/tested to the relevant
standards including ASTM, ASME and API etc.
General Properties
Alloy 317LMN and 317L are molybdenum-bearing austenitic stainless
steels with greatly increased resistance to chemical attack as
compared to the conventional chromium-nickel austenitic stainless
steels such as Alloy 304. In addition, 317LMN and 317L alloys offer
higher creep, stress-to-rupture, and tensile strengths at elevated
temperatures than conventional stainless steels. All are low carbon
or "L" grades to provide resistance to sensitization during welding
and other thermal processes. The "M" and "N" designations indicate
that the compositions contain increased levels of molybdenum and
nitrogen respectively. The combination of molybdenum and nitrogen
is particularly effective in enhancing resistance to pitting and
crevice corrosion, especially in process streams containing acids,
chlorides, and sulfur compounds at elevated temperatures. Nitrogen
also serves to increase the strength of these alloys. Both alloys
are intended for severe service conditions such as flue gas
desulfurization (FGD) systems.
Composition
| ||
Element | Type 317L | Type 317LMN |
Carbon | 0.03 max | 0.03 max |
Manganese | 2.00 | 2.00 |
Silicon | 0.75 max | 0.75 max |
Chromium | 18.00 20.00 | 17.00 20.00 |
Nickel | 11.00 15.00 | 13.50 17.50 |
Molybdenum | 3.00 4.00 | 4.00 5.00 |
Phosphorus | 0.04 max | 0.04 max |
Sulfur | 0.03 max | 0.03 max |
Nitrogen | 0.10 max | 0.10 0.20 |
Iron | Balance | Balance |
UNS No. | S31703 | S31726 |
Resistance to Corrosion
Alloys 317L and 317LMN stainless steels are more resistant to
atmospheric and other mild types of corrosion than conventional
chromium-nickel stainless steels. In general, environments that are
not corrosive to 18Cr-8Ni steels will not attack alloys containing
molybdenum, with the exception of highly oxidizing acids such as
nitric acid.
Alloys 317LMN and 317L stainless steels are considerably more
resistant than conventional chromium-nickel types to solutions of
sulfuric acid. Resistance increases with alloy molybdenum content.
These alloys are resistant to sulfuric acid concentrations up to 5
percent at temperatures as high as 120 F (49C). At temperatures
under 100 F (38 C) these alloys have excellent resistance to
solutions of higher concentration. However, service tests are
recommended to account for the affects of specific operating
conditions that may affect corrosion behavior. In processes where
condensation of sulfur-bearing gases occurs, these alloys are much
more resistant to attack at the point of condensation than
conventional Alloy 316. The acid concentration has a marked
influence on the rate of attack in such environments and should be
carefully determined by service tests.
The table below compares the corrosion resistance of annealed strip
samples of 317LMN and 317L stainless steels in a variety of
solutions related to the process industries as well as standard
ASTM tests. Data on Alloy 316L and Alloy 276 are presented for
comparison.
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Test | Corrosion Rate in Mils per Year (mm/y) | |||
Alloy | Alloy | Alloy | Alloy | |
20% | 0.12 | 0.48 | 0.12 | 0.48 |
45% | 23.41 | 18.37 | 11.76 | 2.76 |
10% | 48.03 | 44.90 | 35.76 | 11.24 |
20% | 0.06 | 0.72 | 0.24 | 0.36 |
10% | 635.7 | 298.28 | 157.80 | 13.93 |
10% | 71.57 | 55.76 | 15.60 | 2.64 |
50% | 77.69 | 32.78 | 85.68 | 17.77 |
ASTM A262 | 26.04 | 20.76 | 17.28 | 264.5 |
ASTM A262 | 22.31 | 19.68 | 16.32 | 908.0 |
ASTM A262 | Pass | Pass | Pass | Pass |
The low carbon (less than 0.03%) of these alloys effectively prevents sensitization to intergranular corrosion during thermal processes such as welding or forging. The higher chromium contents of 317LMN and Alloy 317L stainless steels also provide superior resistance to intergranular attack. It should be noted that prolonged exposure in the range 800 to 1400F (427-816C) can be detrimental to intergranular corrosion resistance and may also cause embrittlement due to precipitation of sigma phase. The higher nitrogen content of the 317LMN alloy retards the precipitation of sigma phase as well as carbides.
| |
Alloy | PRE |
Alloy 316 | 25 |
Alloy 317L | 30 |
Alloy 317LMN | 38 |
Alloy 625 | 52 |
Alloy C276 | 69 |
High molybdenum and nitrogen contents can significantly improve
pitting resistance as illustrated in the preceding table of Pitting
Resistance Equivalents (PRE). The PRE is based on the results of
corrosion tests in which it was found that nitrogen was 30 times
more effective than chromium and approximately 9 times more
effective than molybdenum in enhancing chloride pitting resistance.
The temperature of the onset of crevice corrosion as determined in
a modified AST G-48B test is a useful means of ranking the relative
resistance of stainless and nickel-base alloys. The Critical
Crevice Corrosion Temperatures table that follows demonstrates that
crevice corrosion resistance for austenitic stainless steels
increases with the alloy molybdenum and nitrogen content.
| |||
Alloy | Weight Loss (g/cm2) | ||
24C | 50C | 70C | |
Alloy 317L | 0.0007 | 0.0377 | 0.0500 |
Alloy 317LMN | 0.0000 | 0.0129 | 0.0462 |
Alloy 625 | 0.0000 | 0.0000 | 0.0149 |
Alloy C276 | 0.0000 | 0.0001 | 0.0004 |
*72-hour exposure based on ASTM G-48B procedure using the following
solution:
7 vol.%H2SO4, 3 vol%HCI, 1 wt% CuCl2, 1 wt%FeCl3
Oxidation Resistance
The chromium-nickel-molybdenum steels all have excellent resistance
to oxidation and a low rate of scaling in ordinary atmospheres at
temperatures up to 1600-1650F (871-899C).
Fabrication
The physical and mechanical properties of 317LMN and Alloy 317L
stainless steels are similar to those of more conventional
austenitic stainless steels and can, therefore, be fabricated in a
manner similar to Alloys 304 and 316.
Heat Treatment
Forging
The recommended initial temperature range is 2100-2200F
(1150-1205C) with a finishing range of 1700-1750F (927-955C).
Annealing
317LMN and Alloy 317L stainless steels can be annealed in the
temperature range 1975-2150F (1080-1175C) followed by an air cool
or water quench, depending on thickness. Plates should be annealed
between 2100F (1150C) and 2150F (1175C). The metal should be cooled
from the annealing temperature (from red/white to black) in less
than three minutes.
Hardenability
These grades are not hardenable by heat treatment.
The use of an overalloyed filler is suggested to maintain corrosion
resistance in the as-welded condition. Filler metals containing at
least 6% molybdenum are suggested for welding Alloy 317L and a
filler metal with at least 8% molybdenum, such as Alloy 625, is
suggested for 317LMN. In applications where it is not possible to
use an overalloyed filler metal or to perform a post-weld anneal
and pickle treatment, the severity of the service environment
should be carefully considered to determine if the properties of
autogenous welds (weld made without a filler) are satisfactory. The
optimum corrosion resistance of autogenously welded 317LMN and
Alloy 317L stainless steels is obtained by post-weld annealing and
pickling. ASTM A-380 ecommended Practice for Descaling and Cleaning
Steel Surfaces is suggested for more information.
Mechanical Properties
The ASTM specified minimum tensile properties and maximum hardness
for annealed plate, sheet, and strip products are shown in the
following table.
| ||
Property | Alloy 317L | Alloy 317LMN |
Ultimate Tensile Strength, ksi (MPa) | 75 | 80 |
0.2% Yield Strength, ksi (MPa) | 30 | 35 |
% Elongation in 2 (5.1 cm) | 40 | 40 |
Hardness, Maximum | 217BHN | |
UNS No. | S31703 | S31726 |
Physical Properties
The physical property data which follows represent the
iron-chromium-nickel-molybdenum class of stainless steels. For all
practical purposes, the data are applicable to 317LMN and Alloy
317L stainless steels. All properties are at room temperature (68
F, 20C) unless stated otherwise.
| 0.29 | lb/in3 |
Modulus of Elasticity | 29 106 | psi |
Melting Range | 2410 to 2550 | F |
Thermal Conductivity | 100.8 | Btu/ft2-hr-F-in |
Coefficient of Thermal Expansion | 9.2 (16.5) | 10-6/F (10-6/C) |
Specific Heat | 0.11 | Btu/lb-F |
Electrical Resistivity | 31.1 | -ohm-in |
Magnetic Permeability | 1.0028 | at H = 200 oe |