Description

SS 321/321H U Bend Pipes & Tubes for Heat Exchangers!

One of the largest manufacturer and supplier of stainless steel 321/321H seamless U bend tubes. All our tubes are 100% quality tested, which include chemical testing, mechanical testing as well as hydro testing. All SS 321/321H U bend Tubes are heat treated, solution annealed, and pass hydrostatic test and eddy current test.

Each SS 321/321H U bend tube of our range is quality checked by our quality team on every stage of production to deliver the clients defect free best quality products.

• OD 9.5mm – 38.1mm
• WT up to 6.35mm
• Bending radii 1.25 x OD up to 1700mm
• Bends can be supplied in accordance with TEMA R / ASTM SA/A556
• Leg length up to 15000mm
• Heat treatment where required by electric furnance or direct resistance
• All tubes are stress relieved after U-bending
• Hydrotesting up to 10,000 psi

Why Buy AISI 321/321H, 1.4878/1.4541, UNS S32100/S32109 Seamless Pipes from Metallica Metals?

• Large Scale Enterprise – Metallica is biggest stock holding, manufacturing and processing company of SS 321/321H U bend tubes in India. Our large volume production, sales and purchase enables us to offer our products at the most competitive prices in the industry.
• Testing of Stainless Steel 321/321H U Bend Tubes – All SS 321/321H U bend tubes are subjected to hydrostatic test, eddy current test, chemical and mechanical tests during the various stages of production.
• Marking & Packing of Stainless Steel 321/321H U Bend Tubes – Marking on all pipes is as per the predefined rules in the specification.
• Test Certificates & Inspection of SS 321/321H U Bend Tubes – All our pipes are supplied with Mill test Reports, as per EN 10204 3.1. We can also allow third party inspection of all our products before delivery.
• We have own QC team to control the quality to meet particular standard strictly
• Short Lead Times – We can offer AISI 321/321H, 1.4878/1.4541, UNS S32100/S32109 U bend tubes and pipes with shortest delivery time.
• We can produce either standard or non-standard of the stainless steel 321/321H U bend pipes.

What is 321/321H Stainless Steel?

Stainless Steel 321 is a basic austenitic 18/8 steel (Grade 304) blend of chromium and nickel is stabilised by Titanium (321) addition. SS 321 is used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850°C. Stainless Steel 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling, embrittlement and phase stability with resistance to subsequent aqueous corrosion. It is protected from temperatures ranging from 800 to 1500° F. The metal displays high strength and resistance to various forms of corrosions, including that from aqueous environments. Type 321 finds application in heavy welding components, along with dynamic environments that are subject to changes. Beyond this, stainless steel 321 has excellent forming characteristics, does not require annealing after being welded, and displays toughness in a range of temperatures. The metal shows strength even when exposed to cryogenic temperatures. Additionally, it is often chosen over Type 304 for its increased resistance to creep and rupture. Both metals may be susceptible to stress corrosion cracking. It is used to manufacture high quality carbon structural steel seamless steel tubes for hot rolling and cold drawing (rolling) of superheated steam pipe, boiling water pipe and locomotive boiler superheated steam pipe, large smoke pipe, small smoke pipe and arch brick.

SS 321H is a modification of SS 321 with a higher carbon content, to provide improved high temperature strength. In addition, 321H is stabilized by an addition of niobium to resist intergranular corrosion. It is also able to withstand higher temperatures than type 321, due to its elevated carbon levels. While 321H displays the same welding and forming characteristics of type 321, the metal cannot be hardened by heat treatment. It is utilized in situations where type 321 cannot withstand the high temperatures, typically those exceeding 1000° F. Type 321H displays better resistance against creep than both 321 and 304 stainless steels. 321H also shows resistance against acid corrosion in a variety of environments. Lower temperatures provide better resistance, but the metal is able to withstand up to a 10% acid solution, that has been diluted, at elevated temperatures. However, the metal shows very little resistance against chlorine or sulfuric solutions at any given temperature. Given their similar composition and characteristics, it is possible for stainless steels 321 and 321H to become dually certified.

Manufacturing Range for Stainless Steel 321/321H, 1.4878/1.4541, UNS S32100/S32109 Seamless or Welded Stainless Steel Pipes

Chemical Composition of ASTM A312 TP321/TP321H, 1.4878/1.4541, UNS S32100/S32109 Seamless or Welded Stainless Steel Pipes

Physical Properties of ASTM A312 TP321/TP321H, 1.4878/1.4541, UNS S32100/S32109 Seamless or Welded Stainless Steel Pipes

Mechanical Properties of ASTM A312 TP321/TP321H, 1.4878/1.4541, UNS S32100/S32109 Seamless or Welded Stainless Steel Pipes

Other Grades Chemical Composition Comparision

Other Grades Mechanical Properties Comparision