Stainless Steel Sheets / Plates 321 / 347

Alloy 321/347
Ridhi Siddhi Steel Corporation stocks Alloy 347 & Alloy 321 stainless steel Sheets & Plate in thicknesses from 3/16" through 3" (5mm to 75mm). A high carbon version, Alloy 347H (UNS S34709) & Alloy 321H (UNS S32109) can also be ordered in the same thickness range.

General Properties

Alloys 321 (S32100) and 347 (S34700) are stabilized stainless steels which offer as their main advantage an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500°F (427 to 816°C). Alloy 321 is stabilized against chromium carbide formation by the addition of titanium. Alloy 347 is stabilized by the addition of columbium and tantalum.
Alloys 321 and 347 stainless steels are also advantageous for high temperature service because of their good mechanical properties. Alloys 321 and 347 stainless steels offer higher creep and stress rupture properties than Alloy 304 and, particularly, Alloy 304L, which might also be considered for exposures where sensitization and intergranular corrosion are concerns.
High carbon versions of both alloys are available. These grades have UNS designations S32109 and S34709.

Chemical Composition
Represented by ASTM A240 and ASME SA-240 specifications.

Element	Weight Percentage Maximum Unless Range is Specified
	321	347
Carbon*	0.08	0.08
Manganese	2.00	2.00
Phosphorus	0.045	0.045
Sulfur	0.030	0.03
Silicon	0.75	0.75
Chromium	17.00-19.00	17.00-19.00
Nickel	9.00-12.00	9.00-13.00
Columbium + Tantalum**	-	10xC min to 1.00 max
Tantalum	-	-
Titanium**	5x(C+N) min to 0.70 max	-
Cobalt	-	-
Nitrogen	0.10	-
Iron	Balance	Balance
Iron	Also H grade with Carbon 0.04 – 0.10%. *H grade minimum stabilizer is different formula.

Mechanical Properties
Room Temperature Tensile Properties
Minimum mechanical properties of the stabilized Alloys 321 and 347 chromium-nickel grades in the annealed condition (2000°F [1093°C], air cooled) are shown in the table.

Minimum Room Temperature Mechanical Properties Per ASTM A 240 and ASME SA-240
Alloy	Yield Strength .2% Offset psi (MPa)	Ultimate Tensile Strength psi (MPa)	Elongation in 2 in. (%)
321	30,000 (205)	75,000 (515)	40.0
347	30,000 (205)	75,000 (515)	40.0

Minimum Room Temperature Mechanical Properties Per ASTM A 240 and ASME SA-240
Alloy	Hardness, Maximum
Alloy	Plate	Sheet	Strip
321	217 Brinell	95Rb	95Rb
347	201 Brinell	92Rb	92Rb

IntergranularCorrosion
Alloys 321 and 347 have been developed for applications where the unstabilized chromium-nickel steels, such as Alloy 304, would be susceptible to intergranular corrosion.

Heat Treatment
The annealing temperature range for Alloys 321 and 347 is 1800 to 2000°F (928 to 1093°C). While the primary purpose of annealing is to obtain softness and high ductility, these steels may also be stress relief annealed within the carbide precipitation range 800 to 1500°F (427 to 816°C), without any danger of subsequent intergranular corrosion. Relieving strains by annealing for only a few hours in the 800 to 1500°F (427 to 816°C) range will not cause any noticeable lowering in the general corrosion resistance, although prolonged heating within this range does tend to lower the general corrosion resistance to some extent. As emphasized, however, annealing in the 800 to 1500°F (427 to 816°C) temperature range does not result in a susceptibility to intergranular attack.

Value Added Processes

Plasma Cutting
Abrasive Waterjet Cutting
Machine cut
Sawcut
Drilling,Taping
Counterboring
Milling
Polishing
Flattening
Rolled & Welding Rings

Certificates: EN10204 3.1 / DIN 50049 3.1 / ISO 10474 3.1 Mill Test Certificate, NACE MR-0103 / NACE MR-0175

Third Party Inspection Agency : LRS (Lloyd's Register), GL (Germanischer Lloyd), BV (Bureau Veritas), DNV (Det Norske Veritas), ABS (American Bureau of Shipping), SGS, TUV, RINA, IRS, EIL, CEIL.

Available Specifications
ASTM A240, ASTM A240M, ASTM A167, ASTM A167M Grade 321, 321H, 347, 347H ASTM A 240, ASTM A 240M, ASTM A 167, ASTM A 167M Gr. 321, 321H, 347, 347H ASTM SA240, ASTM SA240M, ASME SA240, ASTM SA167, ASTM SA167M, ASME SA167 Grade 321, 321H, 347, 347H ASTM SA 240, ASTM SA 240M, ASME SA 240, ASTM SA 167, ASTM SA 167M, ASME SA 167 Gr. 321, 321H, 347, 347H ASTM A240, ASTM A240M, ASTM A167, ASTM A167M TYPE 321, 321H, 347, 347H ASTM A 240, ASTM A 240M, ASTM A 167, ASTM A 167M TYPE 321, 321H, 347, 347H ASTM SA240, ASTM SA240M, ASME SA240, ASTM SA167, ASTM SA167M, ASME SA167 TYPE 321, 321H, 347, 347H ASTM SA 240, ASTM SA 240M, ASME SA 240, ASTM SA 167, ASTM SA 167M, ASME SA 167 TYPE 321, 321H, 347, 347H Material number 1.4541, 1.4541, DIN -X6CrNiTi18-10, X6CrNiTi18-10, SS321, SS-321, 321 Werkstoff number 1.4541, 1.4541, DIN -X6CrNiTi18-10, X6CrNiTi18-10, SS321, SS-321, 321 Material number 1.4550, 1.4550, DIN - X6 CrNiNb 1810, X6 CrNiNb18-10, SS347, SS-347, 347 Werkstoff number 1.4550, 1.4550, DIN - X6 CrNiNb 1810, X6 CrNiNb18-10, SS347, SS-347, 347 AISI-321, AISI-321H, AISI-347, AISI-347H AISI 321, AISI 321H, AISI 347, AISI 347H UNS S32100, UNS 32100, UNS S32109, UNS 32109 UNS S34700, UNS 34700, UNS S34709, UNS 34709 UNS-S32100, UNS-32100, UNS-S32109, UNS-32109 UNS-S34700, UNS-34700, UNS-S34709, UNS-34709

Stock Available
S.S.Plate as per ASTM A240M Type - 347
Size:1250 X 2500 X 6 MM - 12 NOS
Size:1250 X 2500 X 16 MM - 6 NOS
Size:1250 X 2500 X 25 MM - 3 NOS

Request a quote


Corrosion Resistant Steel Plates / Weather Resistant Steel Plates	Corrosion Resistant Steel Plates / Weather Resistant Steel Plates

Low Alloy Steel Plates (15CR13MO6)	Low Alloy Steel Plates(15CR13MO6)

Stainless Steel Sheets / Plates 321 / 347	Stainless Steel Sheets / Plates 321 / 347

Stainless Steel Sheets / Plates 304LN	Stainless Steel Sheets / Plates 304LN

Carbon Steel Structural Plates (ASTM A283 & A285)	Carbon Steel Structural Plates (ASTM A283 & A285)

Stainless Steel Sheets / Plates 309S	Stainless Steel Sheets / Plates 309S