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ASTM A350 LF2 Blind Flange

ASTM A350 LF2 Blind Flange is a common low-temperature carbon steel material, mainly used in the manufacture of low-temperature and high-pressure forged pipe fittings and flanges.

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ASTM A350 Blind flange , as an important component in the pipeline system, is mainly used to seal the end of the pipeline that does not need fluid to pass through, in order to ensure the tightness and integrity of the pipeline system. It is usually made of ASTM  A350 low temperature steel, which has good low temperature toughness and mechanical properties and is particularly suitable for low temperature environments.

ASTM A350 blind flange is widely used in petroleum, chemical industry, natural gas, cryogenic engineering, refrigeration technology and other fields. In these areas, piping systems need to withstand extreme conditions such as high pressure and low temperatures.

Blind Flange Specification and Material

Size Range 1/2″ – 24″/ DN15 – DN600
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
Carbon Steel ASTM A105 / A105N, ASTM A350 LF2/LF3, ASTM A694 F42 / 46 / 56 / 60 / 65, P235GH, P265GH, P280GH, P355GH
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 321, 310S, 317,347,904L,1.4404, 1.4437.
Duplex Stainless Steel ASTM A182 F51, F53, F44

ASTM A350 LF2 Chemical component

CHEMICAL LIMITS C Mn P S Si Cu Ni Cr Mo V Nb
ASTM A350 LF2 MIN 0.60 0.15
MAX 0.30 1.35 0.035 0.040 0.35 0.40 0.40 0.30 0.12 0.08 0.02

ASTM A350 LF2 mechanical property

MATERIAL T.S (MPA) Y.S (MPA) EL % R/A % HARDNESS
ASTM A350 LF2 485-655 250 min 22 min 30 min 197 max

Class 900 Blind Flange Weight (kg)

The pressure rating for flange include class150, 300, 400, 600, 900, 1500, 2500.

Pressure rate means the pressure the flange can bear. Usually, the pressure rate should conform to the pressure of the pipeline. Such as class 900 blind flange means the pressure rate is class 900.

DN NPS BL Flange
15 1/2 2
20 3/4 2.5
25 1 3.5
32 1-1/4 4
40 1-1/2 6
50 2 10
65 2-1/2 14
80 3 20
100 4 27
125 5 37
150 6 48
200 8 83
250 10 122
300 12 173
350 14 206
400 16 259
450 18 367
500 20 463
600 24 876

 

 

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