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Stainless Steel · Flanges · ASTM A182 / ASME SA182 F321H

SS 321H Stainless Steel Flanges

In short: SS 321H flanges forged to ASTM A182 F321H are used on refinery hydroprocessing and heater lines, in weld-neck and blind types to ASME B16.5.

S32109
UNS number
7.93
density, g/cm³
3.1 / 3.2
EN 10204 certificates
5
SS 321H product forms
Quote SS 321H flanges →Sizes and weights
SS 321H flanges: specification designationsASTM A182 / ASME SA182 F321H DESIGNATIONS FOR SS 321H FLANGES ASTM A182ASME SA182 F321H Marked on every piece with heat number and size; matched to the 3.1 / 3.2 certificate.
Calculated values for estimating; actual weights vary within tolerances.

Why this combination

Why SS 321H in flanges

Carbon 0.04–0.10% with Ti stabilisationCoarse grain (ASTM No. 7 or coarser) for creepHigher allowable stresses than SS 321 at temperatureCommon in refinery and boiler service

Flanges in hot hydrogen service are heavily loaded and thermally cycled; F321H matches the pipe's high-temperature properties.

High-pressure classes often use ring-type joint facings.

Specification

How to specify SS 321H flanges

NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request

SS 321H flanges ASTM A182 / ASME SA182 F321H
SS 321H flanges: ASTM A182 / ASME SA182 F321H
Specification
ASTM A182 / ASME SA182 F321H
UNS
S32109
EN / W.Nr.
1.4878
Dimensions
ASME B16.5 / B16.47; RTJ facing common in high classes

Sizes and weights

SS 321H flanges sizes, weighed at 7.93 g/cm³

Other sizes on request. For general flanges information, such as manufacturing routes and end finishes, see the flanges guide.

NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request

Chemistry

SS 321H composition

UNS
S32109
EN / W.Nr.
1.4878 · X8CrNiTi18-10 (related)
Density
7.93 g/cm³
SS 321H Stainless Steel chemical composition, % (ASTM A240)
ElementLimit, %Why it matters
C0.04 – 0.10
Mn2.00 max
P0.045 max
S0.030 max
Si0.75 max
Cr17.0 – 19.0
Ni9.0 – 12.0
Ti4×(C+N) – 0.70
N0.10 max

Limits per ASTM A240; other product forms and specifications differ slightly. Your order's specification and edition govern.

0%5%10%15%20% Mn Cr Ni
Main alloying elements of SS 321H Stainless Steel: bars show the permitted range (ASTM A240).

Questions

About SS 321H flanges

Which bolting suits F321H flanges?

High-temperature alloy bolting such as B16, or stainless grades, per design.

Are F321H flanges available in Class 1500?

Yes, to order.

From enquiry to dispatch

How a SS 321H flanges order runs

  1. 01 EnquiryGrade, specification, size, quantity
  2. 02 ReviewChecked against your standard
  3. 03 InspectPMI, dimensions, TPI if required
  4. 04 CertifyEN 10204 3.1 / 3.2, heat traceable
  5. 05 ShipPacked and documented for the destination

Need SS 321H flanges?

Send size, quantity, specification and destination. We reply with availability, certificates and delivery.

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