Alloy 31 Flange

JN ALLOY supplies alloy 31 SO flanges, alloy 31 WN flanges, UNS N08031 blind flanges, 1.4562 alloy 31 plain flanges, ASTM B564 Alloy 31 UNS N08031 SW flanges, aloy 31 spectacle blind flanges, alloy 31 threaded flanges, 1.4562 spacer ring, UNS N08031 paddle blind/blank, alloy 31 bleed/test/drip ring, alloy 31 reducing flange.

Alloy 31 flange(UNS N08031, 1.4562) is a high-performance corrosion-resistant alloy flange made of nickel-chromium-molybdenum-iron-based superalloy (UNS N08031), designed for extreme corrosive environments. UNS N08031 flange is composed of about 31% nickel as the core component, supplemented by 27% chromium, 6.5% molybdenum and 1.2% copper. The addition of nitrogen further enhances the resistance to pitting and crevice corrosion. Its PREN value reaches 45+, which is significantly better than conventional stainless steel. The unique combination of ingredients makes it perform well in strong corrosive media such as concentrated sulfuric acid, phosphoric acid, and acid halides, especially in high temperature (up to 550℃) chloride ion environment. Alloy 31 still maintains excellent resistance to stress corrosion cracking. Jinie Technology (Jiangsu) Co., LTD supply all different types and scales of flanges. Please feel free to contact us for further product information and pricing.

Alloy 31 Flanges Manufacturing Process

Alloy 31 flange strictly follows international standards such as ASME B16.5/B16.47 and DIN/EN, covering WN (weld neck welding), SO (slip on welding), SW (socket welding), LJ (lap joint welding) and other types, and the pressure level covers Class 150 to 2500. It is manufactured by advanced hot forming (1100-1250℃) or cold processing technology, and combined with solution annealing (1150-1200℃ water quenching) treatment to ensure intergranular corrosion resistance. The flange sealing surface can be processed in various forms such as RF, FF, RTJ, and the surface is pickled and passivated to enhance the stability of the passivation film.

Application of Alloy N08031 Flange

Alloy 31 flange is widely used in chemical reactors (concentrated sulfuric acid cooling system), offshore platform seawater treatment, oil and gas industry acid gas field pipelines, pharmaceutical industry hydrochloric acid recovery devices and other scenarios. Alloy 1.4562's outstanding advantages are: resistance to boiling concentration 70% sulfuric acid and 50% phosphoric acid corrosion, life in seawater + hydrogen sulfide composite environment is more than 10 times longer than 316L, excellent welding compatibility, while maintaining 650MPa high tensile strength and 35% elongation, taking into account both safety and economy.

ALLOY 31 Flange Specification

Material: ASTM B564 Standard Specification for Nickel Alloy Forgings

Standard: ASME B16.5, ASME B16.47, DIN, EN, BS, JIS

Size: 1/2"-48", DN6-DN400

Class: 150#,300#,400#,600#,900#,1500#,2500#

Alloy 31 Flange Chemical Composition

Grade	UNS	C≤	Mn≤	P≤	S≤	Si≤	Ni	Cr	Cu	Mo	N
Alloy 31	N08031	0.015	2	0.025	0.01	0.3	30.0-32.0	26.0-28.0	1.0-1.4	6.0-7.0	0.15-0.25

UNS N08031 Flange Mechanical Properties

Mechanical properties	Tensile, min, ksi[MPa]	Yield, min, ksi[MPa]	Elongation, %(min)
Alloy 31	94[650]	40[276]	40

Alloy 1.4562 Flange Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS	EN
Alloy 31	1.4562	N08031	X1NiCrMoCu32-28-7

UNS N08031 Flange Sizes Specified by Common Standards

Flange Type	Specifications
	ASME/ANSI B16.5	ASME B16.47 Series A (or MSS SP-441)	ASME B16.47 Series B (or API 6052)	BS 4504 (ISO 7005-1)	BS 3293
	Nominal Pipe Sizes
	< NPS 26	>NPS 26	>NPS 26	DN 10 to DN 4000	> NPS 26
	Nominal Pressure (Class)
	Class (lb)	Class (lb)	Class (lb)	PN (bar)	Class (lb)
Weld Neck	150-2500	150-900	75-900	2.5-40	150-600
Slip-on	150-1500	-	-	2.5-40	150-600
Blind	150-2500	300-900	300-900	2.5-40	-
Lap Joint	150-2500	-	-	6-403	-
Socket Weld	150-1500	-	-	N/A	-
Threaded	150-2500	-	-	6-40	-
Flat/Raised Facings	As above	As above	As above	As above	As above
Ring Joint Facings	150-2500	300-900	300-900	2.5-40	300-600
Other Facings	150-25003	-	-	2.5-40	-

Alloy 31 Blind Flange Dimensions Class 600 (ASME B16.5)

Pipe

Flange Data

Raised Face

Drilling Data

Weight

Nominal

Pipe

Size

Outside

Diameter

Flange min

Thickness

Face

Diameter

Number of

Holes

Bolt Hole

Diameter

Diameter
of Circle
of Holes

kg/piece

in
mm

1/2

3.750

95.20

0.560

14.20

1.380

35.10

0.620

15.70

2.620

66.55

0.76

3/4

4.620

117.3

0.620

15.70

1.690

42.90

0.750

19.10

3.250

82.60

1.28

4.880

123.9

0.690

17.50

2.000

50.80

0.750

19.10

3.500

88.90

1.60

11/4

5.250

133.3

0.810

20.60

2.500

63.50

0.750

19.10

3.880

98.60

2.23

11/2

6.120

155.4

0.880

22.30

2.880

73.15

0.880

22.40

4.500

114.3

3.25

6.500

165.1

1.000

25.40

3.620

91.90

0.750

19.10

5.000

127.0

4.15

21/2

7.500

190.5

1.120

28.40

4.120

104.6

0.880

22.40

5.880

149.4

6.13

8.250

209.5

1.250

31.70

5.000

127.0

0.880

22.40

6.620

168.1

8.44

31/2

9.000

228.6

1.380

35.00

5.500

139.7

1.000

25.40

7.250

184.2

11.0

10.75

273.1

1.500

38.10

6.190

157.2

1.000

25.40

8.500

215.9

17.3

13.00

330.2

1.750

44.50

7.310

185.7

1.120

28.40

10.50

266.7

29.4

14.00

355.6

1.880

47.80

8.500

215.9

1.120

28.40

11.50

292.1

36.1

16.50

419.1

2.190

55.60

10.62

269.7

1.250

31.75

13.75

349.3

58.9

20.00

508.0

2.500

63.50

12.75

323.9

1.380

35.10

17.00

431.8

97.5

22.00

558.8

2.620

66.55

15.00

381.0

1.380

35.10

19.25

489.0

124

23.75

603.3

2.750

69.85

16.25

412.8

1.500

38.10

20.75

527.1

151

27.00

685.8

3.000

76.20

18.50

469.9

1.620

41.10

23.75

603.3

214

29.25

743.0

3.250

82.60

21.00

533.4

1.750

44.50

25.75

654.1

272

32.00

812.8

3.500

88.90

23.00

584.2

1.750

44.50

28.50

723.9

349

37.00

939.8

4.000

101.6

27.25

692.2

2.000

50.80

33.00

838.2

533