Short Description

Model No.: SMO-254-Seamless-Lap-Joint-Stub-End-8"-SCH20

China Seamless Stub End Manufacturer www.metallicsteel.com offers MSS SP-43 ASTM A403 SMO 254 Seamless Lap Joint Stub End, 8″, SCH20.

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Key Specifications / Features

Type: SMO 254 Lap Joint Stub End
Material: F44 (254SMO,UNS S31254,EN 1.4547)
Size: 8″
Standard: MSS SP-43
WT: SCH20

Chemical Composition and Mechanical Property for F44 (254SMO,UNS S31254,EN 1.4547)

Steel Grade

Chemical Composition

Mechanical Performance

 

C(Max)

Si(Max)

Mn(Max)

P(Max)

S(Max)

Ni

Cr

N

Mo

Cu

Tensile Strength
(Min),Mpa

Yield Strength
(Min),Mpa

F44 (254SMO,UNS S31254,EN 1.4547)

0.02

0.80

1.00

0.030

0.010

17.50–18.50

19.50–20.50

0.18-0.25

6.00-6.50

0.50-1.00

680

300

20200323072533 41007 - MSS SP-43 ASTM A403 SMO 254 Seamless Lap Joint Stub End 8" SCH20

Dimensions butt welded Stub Ends schedule 10S MSS SP-43 type A/B

NPS OD T G F R
Type A
R
Type B
4 114.3 3.05 157.2 76.2 11.18 0.76
5 141.3 3.40 185.7 76.2 11.18 1.52
6 168.3 3.40 215.9 88.9 12.7 1.52
8 219.1 3.76 269.9 101.6 12.7 1.52
10 273.1 4.19 323.9 127 12.7 1.52
12 323.9 4.57 381 152.4 12.7 1.52
14 355.6 4.78 412.8 152.4 12.70 1.52
16 406.4 4.78 469.9 152.4 12.7 1.52
18 457.2 4.78 533.4 152.4 12.70 1.52
20 508 5.54 584.2 152.4 12.70 1.52
24 609.6 6.35 692.2 152.4 12.7 1.52

Dimensions are in millimeters unless otherwise indicated. Weights are in kilograms and approximately given.

DIMENSIONAL TOLERANCES OF STUB ENDS MSS SP-43

Nominal Pipe Size 1/2 up to 2.1/2 3 to 3.1/2 4 5 to 8 10 to 18 20 to 24
Outside Diameter at Welding End (OD) 0.8 0.8 0.8 + 1.6
– 0.8
+ 2.29
– 0.76
+ 3.05
– 0.76
Overall Length (F) 1.6 1.6 1.6 1.6 2 2
Outside Diameter of Lap (G) + 0
– 0.76
+ 0
– 0.76
+ 0
– 0.76
+ 0
– 0.76
+ 0
– 1.6
+ 0
– 1.6
Thickness of Lap (T) + 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
Fillet Radius of Lap (R) + 0
– 0.76
+ 0
– 0.76
+ 0
– 1.6
+ 0
– 1.6
+ 0
– 1.6
+ 0
– 1.6
Wall Thickness (t) Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated.

Notes:

  • Type A for Lap Joint Flanges
  • Type B for Slip On Flanges
  • MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

What is F44?

F44 (also called EN 1.4547, UNS S31254, 254 SMO and SS2378) is a high alloyed austenitic stainless steel with exceptionell corrosion resistance. is a very high end austenitic stainless steel. It is designed with a combination of impact toughness resistance to chloride stress corrosion cracking, and pitting and crevice corrosion with strength that is twice that of the stainless steel 300 series.
The 6Mo super austenitic steel combines moderate tensile strength and high ductility with excellent corrosion resistance in seawater and variety of industrial environment. Typically the alloy has PREN of 42 – 44, which ensure that the resistance to pitting corrosion is high and it also has a hight resistance to crevice corrosion.
Welding
Welding of stainless steel grade 254 SMO requires filler material without which it results in poor strength properties. Filler metals such as AWS A5.14 ERNiCrMo-3, and alloy 625 are recommended. Electrodes used in the process, have to match with AWS A5.11 ENiCrMo-12.
Annealing
Annealing of this material should be performed at 1149-1204°C (2100-2200°F), which should be followed by a water quench.
Hot Working
Forging, upsetting and other operations relating to this material can be performed at 982 – 1149°C (1800 – 2100°F). It is recommended that temperatures do not exceed this range as it would result in scaling and reduction in the workability of the material. To re-attain maximum corrosion resistant properties, it is advisable to perform post-process annealing.
Cold Working
Cold working can be carried out using all the traditional methods; however the process would be tough due to its high work hardening rate. The result will provide the material with increased strength and toughness.
Hardening
Stainless steel grade 254 SMO does not respond to heat treatment. Hardening is possible only through cold reduction.

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Brand Name
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Name
MSS SP-43 ASTM A403 SMO 254 Seamless Lap Joint Stub End 8" SCH20
Price
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Product Availability
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