MANUFACTURER & EXPORTER OF STAINLESS STEEL SEAMLESS PIPES & TUBES AND HIGH NICKEL ALLOYS PIPES , HEAT EXCHANGER TUBES
   
  304/L PIPES , 316/L PIPES , 321 PIPES , 317L PIPES , 347 PIPES , 904L TUBES ,
INCONEL 625 TUBES , INCONEL 825 TUBES , MONEL 400 TUBES , A 106 GR B , A336 GR 6
PIPES , API-5LGR.B/X42/X46/X52/X60/X65/X75 , ASTM A335 GR. P-1/P-2/P-5/P-9/P-11/
P-12/P-22/P-91/P-92/P-122

Manufacturer, Supplier & Exporter of 321 tubos de acero inoxidable | 321 Stainless Steel pipa |321 paip keluli
     
 
Steel Pipes & Tubes
Stainless Steel Pipes & Tubes
ERW Pipes & Tubes
Carbon Steel Pipes & Tubes
Alloy Steel Pipes & Tubes
Mild Steel Pipes & Tubes
Capillary Pipes
Steel Coils and Sheet
Steel Plates
Forged Pipe Fittings
Butt Weld Fittings
Olets & Outlets Fittings
Flanges
Steel Round Bars
Fasteners
Nickel
Cupro Nickel Tubes
Hastelloy Products
Inconel Products
Monel Products
Duplex Steel Products
IBR Products
Copper
Titanium
Brass
Alloy 20 Products
Alluminium Products
Round Bar
   
   

   
   
   
   
 
ASTM A213 AISI TP321 Stainless Steel Pipes & Tubes  
Manufacturer, Supplier & Exporter of 321 Stainless Steel Pipes & Tubes, 321 tubos de acero inoxidable | 321 Stainless Steel pipa | 321 paip keluli in India
Section Links :

Grades
: Type 304 | Type 304L | Type 304H | Type 310 | Type 316 | Type 316L | Type 316H | Type 321 | Type 347  |  Type 410  |

Product Range

Specifications: ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790
Sizes (Seamless): 1/2” NB - 24” NB
Sizes (ERW): 1/2” NB - 24” NB
Sizes (EFW): 6” NB - 100” NB  
 
   

Wall Thickness available:
Schedule 5S - Schedule XXS (heavier on request)


 Other Materials Testing:

 NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc.



Dimensions:

All Pipes is manufactured and inspected/tested to the relevant standards including ASTM, ASME and API etc.



Background :

Grades 321 and 347 are the basic austenitic 18/8 steel (Grade 304) stabilised by Titanium (321) or Niobium (347) additions. These grades are used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850°C. Grade 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.
Grade 321H is a modification of 321 with a higher carbon content, to provide improved high temperature strength.A limitation with 321 is that titanium does not transfer well across a high temperature arc, so is not recommended as a welding consumable. In this case grade 347 is preferred - the niobium performs the same carbide stabilisation task but can be transferred across a welding arc. Grade 347 is therefore the standard consumable for welding 321. Grade 347 is only occasionally used as parent plate material.
Like other austenitic grades, 321 and 347 have excellent forming and welding characteristics, are readily brake or roll formed and have outstanding welding characteristics. Post-weld annealing is not required. They also have excellent toughness, even down to cryogenic temperatures. Grade 321 does not polish well, so is not recommended for decorative applications.
Grade 304L is more readily available in most product forms, and so is generally used in preference to 321 if the requirement is simply for resistance to intergranular corrosion after welding. However 304L has lower hot strength than 321 and so is not the best choice if the requirement is resistance to an operating environment over about 500°C.

Composition

Typical compositional ranges for grade 304 stainless steels are given in table 1.

Table 1. Composition ranges for 304 grade stainless steel

Grade   C Mn Si P S Cr Mo Ni N Other
321 min. - - - - - 17.0 - 9.0 -

Ti=5(C+N)

0.70

max. 0.08 2.0 0.75 0.045 0.030 19.0 - 12.0 0.10
321H min.

0.04

- - - - 17.0 - 9.0 -

Ti=4(C+N)

0.70
max. 0.10 2.0 0.75 0.045 0.030 19.0 - 12.0 -
347 min.

-

- - - - 17.0 - 9.0 -

Nb=10(C+N)

1.0
max. 0.08 2.0 0.75 0.045 0.030 19.0 - 13.0 -


Mechanical Properties

Typical mechanical properties for grade 304 stainless steels are given in table 2

Table 2. Mechanical properties of 304 grade stainless steel

Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
Rockwell B (HR B) max Brinell (HB) max
321 515 205 40 92 201
321H 515 205 40 92 201
347 515 205 40 92 201
321H also has a requirement for a grain size of ASTM No 7 or coarser.


Physical Properties

Typical physical properties for annealed grade 304 stainless steels are given in table 3.

Table 3. Physical properties of 304 grade stainless steel in the annealed condition

Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (m/m/°C) Thermal Conductivity (W/m.K) Specific Heat 0-100°C (J/kg.K) Electrical Resistivity (n.m)
0-100°C 0-315°C 0-538°C at 100°C at 500°C
321 8027 193 16.6 17.2 18.6 16.1 22.2 500 720


Grade Specification Comparison

Approximate grade comparisons for 304 stainless steels are given in table 4.

Table 4. Grade specifications for 304 grade stainless steel


Grade UNS No Old British Euronorm Swedish SS Japanese JIS
    BS En No Name    
321 S32100 321S31 58B, 58C 1.4541 X6CrNiTi18-10 2337 SUS 304
321H S32109 321S51 - 1.4878 X10CrNiTi18-10 - SUS 321H
347 S34700 347S31 58G 1.4550 X6CrNiNb18-10 2338 SUS 347
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.


Corrosion Resistance

Equivalent to Grade 304 in the annealed condition, and superior if a weldment in these grades has not been post-weld annealed or if the application involves service in the 425-900°C range. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 60°C.

Heat Treatment

Solution Treatment (Annealing) - heat to 950-1120°C and cool rapidly for maximum corrosion resistance.
Stabilising - heat to 870-900°C for 1 hour per 25mm of thickness and air cool. Stabilisation is recommended for most severe service conditions (above 425°C) and particularly for material annealed at the upper side of the annealing temperature range.
Stress Relief - Heat to 700°C for 1 to 2 hours and air cool.
These grades cannot be hardened by thermal treatment.


 



 
       © All Rights reserved by Victor Steel Corporation 2010.                                                   Web Design Company : advedhaworld.com