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Alloy 20 (UNS N08020) Flanges

General Introduction to Alloy 20 (UNS N08020)

Alloy 20, designated as UNS N08020, is an austenitic corrosion-resistant alloy with nominal composition of 35Ni-35Fe-20Cr-Cb. It has the addition of small amount of copper and molybdenum. Alloy 20 was originally developed in 1951 for dilute sulfuric acid service. Niobium is added which makes the alloy can be used without PWHT. Alloy 20 flanges can be readily made from ASTM B462 UNS N08020 forgings or ASTM B463 UNS N08020 plates. They can be furnished in a variety of flange types including weld neck, slip on, threaded, socket welding, blind, lap joint, and LWN, etc. There are 7 rating classes available: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500.

ASTM B462 UNS N08020 (Alloy 20), weld neck flanges, Class 150 RF, 1-1/2" SCH40.

ASTM B462 UNS N08020 (Alloy 20), weld neck flanges, Class 150 RF, 1-1/2″ SCH40.

Chemical Composition

ElementWt, %
Carbon [C]≤0.07
Manganese [Mn]≤2.00
Phosphorus [P]≤0.045
Sulfur [S]≤0.035
Silicon [Si]≤1.00
Nickel [Ni]32.00~38.00
Chromium [Cr]19.00~21.00
Molybdenum [Mo]2.00~3.00
Copper [Cu]3.00~4.00
Niobium+Tantalum [Nb+Ta]8xCarbon~1
IronRemainder
*The tabulated values are abstracted from ASTM B462 Gr. UNS N08020.

Mechanical Properties

AlloyTensile Strength, min.Yield Strength, min.Elongation, min.Reduction of Area, min.
ASTM B462ksiMPaksiMPa%%
UNS N08020805513524130.050.0
*All values shall be measured at room temperature.
*Alloy 20 flanges shall be supplied in stabilized-annealed condition.

Pressure-Temperature Ratings for Alloy 20(UNS N08020) Flanges

Temp. °CClass 150Class 300Class 400Class 600Class 900Class 1500Class 2500
-29~3820.051.768.9103.4155.1258.6430.9
5019.551.768.9103.4155.1258.6430.9
10017.750.967.8101.7152.6254.4423.9
15015.848.965.397.9146.8244.7407.8
20013.847.262.994.3141.5235.8392.9
25012.145.560.791.0136.5227.5379.2
30010.242.957.085.7128.6214.4357.1
3259.341.455.082.6124.0206.6344.3
3508.440.353.680.4120.7201.1335.3
3757.438.951.677.6116.5194.1323.2
4006.536.548.973.3109.8183.1304.9
4255.535.246.570.0105.1175.1291.6
*Working pressures by classes, unit: bar.

ASTM B16.5 weld neck flange, 300# 4" SCH40 RF, Alloy 20 (UNS N08020) material.

ASTM B16.5 weld neck flange, 300# 4″ SCH40 RF, Alloy 20 (UNS N08020) material.

Temp. °FClass 150Class 300Class 400Class 600Class 900Class 1500Class 2500
-20~10029075010001500225037506250
2002607409901485222537106180
3002307109451420213035505920
4002006809101365204534105680
5001706558751310196532755460
6001406058051210181530255040
6501255907851175176529404905
7001105707551135170528404730
750955307101065159526604430
800805106751015152525404230
*Working pressures by classes, unit: psig.

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