1.4547 Round Bar | Steel grade 1.4547 (UNS S31254 - 254 SMO® - SS2378) in stainless steel
Reliant Pipes & Tubes Pvt. Ltd.

1.4547 Round Bar | Steel grade 1.4547 (UNS S31254 - 254 SMO® - SS2378) in stainless steel

1.4547 Round Bar | Steel grade 1.4547 (UNS S31254 - 254 SMO® - SS2378) in stainless steel

1.4547 Round Bar | Steel grade 1.4547 (UNS S31254 - 254 SMO® - SS2378) in stainless steel

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1.4547 (UNS S31254 – 254 SMO®* – SS2378)

By using 1.4547 (UNS S31254 – 254 SMO®* – SS2378) you get a high alloyed, stainless steel with outstanding  corrosion resistance. The steel is developed for use in halide-containing environment such as seawater. Some common applications are off shore, marine environment and within chemical industry.

1.4547 (also called UNS S31254, 254 SMO®* and SS2378) is a high alloyed austenitic stainless steel with exceptionell  corrosion resistance. The steel is developed for use in  halide-containing environment such as seawater, hydrochloric acid and contaminated sulphuric acid. 1.4547 has a superior resistance to uniform corrosion compared with common stainless steel, especially in acids containing halides.  It has a high content of alloy materials  which gives the steel exceptionally good resistance to pitting and crevice corrosion. The steel also have  very good resistance to stress corrosion cracking.

Typical application areas for 1.4547:

  • Off shore
  • Marine environment
  • Chemical industry
  • Pharmaceutical industry
  • Food industry

Good formability and weldability
1.4547 has a good weldability  and the methods used for welding conventional austenitic steels are used. It is somewhat more sensitive to hot cracking and shall be welded with low heat input.

Filler metal  of type Avesta Welding P12 or  P16 are recommended. These filler metals will give a weld with a resistance to pitting corrosion. The steel can be both cold and hot formed. Due to a higher strength and alloy materials the steel is difficult to machine.

We offer steel grade 1.4547 in the following profiles

Steel grade 1.4547 is a available as machined round bar in dimensions 10 – 320 mm.

If there is something you miss or wonder about you can always contact us to discuss your needs.

Stainless steel                                                 1.4547 / UNS S31254 / F44 / 254 SMO                     Acier Inoxydable

Rustfrit stål                                                                                                                                             Acciai Inossidabli

Rostfrit stål                                                                                                                                             Acero Inoxidable

W.Nr. 1.4547 254 SMO SIS 2378
UNS S31254 AFNOR Z1 CNDU 20.18.06Az JIS 
X1CrNiMoCuN20-18-7 F 44

1.4547 is a high-alloy austenitic stainless steel developed for use in seawater and other aggressive chloride-bearing media. The steel characterized by the following properties: Excellent resistance to pitting and crevice corrosion, High resistance to general corrosion, High resistance to stress corrosion cracking, Higher strength than conventional austenitic stainless steels, Good weldability.

Stock range 

1.4547 - UNS S31254 - F44 round bar hotrolled / forged, peeled / turned acc. DIN EN 10060 ( formerly DIN 1013 ), long 4-6 mtr
Sizes:
Ø 12,70 mm - Ø 304, 8 mm

1.4547 - UNS S31254 - F44 Forgings
Forgings acc. to drawings, bars, discs and rings on request.

1.4547 - UNS S31254 - F44 Sheets/Plates hotrolled Finish 1 
Sizes:
Thickness  3 mm - 70 mm
Width        1000 / 1250 / 1500 / 2000 / 2500 mm
Length       2000 / 2500 / 3000 / 6000 mm

1.4547 - UNS S31254 - F44 sheets / plates 
Plasma cutting
Water-jet cutting
Laser-cutting
Sawn cuttings

Certificates:     EN 10204 / 3.1  

ALLOY 1.4547 / UNS S31254 / 6MO / F44

Corresponding Standards: EN 1.4547, UNS S31254, ASTM A182 Grade F44

MATERIAL DESCRIPTION

• The 6 Mo 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.
• High resistance crevice corrosion.

CHEMICAL COMPOSITION

WEIGHT% C SI MN S P CR NI MO  N  CU
MIN.  19,50  17,50  6,00  0,18  0,50
MAX  0,020  0,80  1,00  0,010  0,030  20,50  18,50  6,50  0,22  1,00

PREN = (CR% + 3.3MO% + 16N%) ≥ 40
PRODUCT STANDARDS: EN 10272, EN 10088, ASTM A276, ASTM A240, ASTM A479, ASTM A182–11A
(CHEMICAL COMPOSITION AND MECHANICAL PROPERTIES ONLY)
APPROVALS: NACE MR0175, NORSOK M650, NORSOK M630 – MDS R11/ R13/ R14/ R15/ R17/ R18

APPLICATIONS

• High resistance to general corrosion.
• Typical applications: Pumps, valves, chokes, pipework/flanges and manifolds in oil and gas industry.

MECHANICAL PROPERTIES

YIELD STRENGTH
RP0.2
MPA
TENSILE STRENGTH
RM
MPA
ELONGATION
[%]
HARDNESS
[HB]
IMPACT
CHARPY-V, -46ºC
[J]
PRE
ALL PRODUCTS  ≥ 300  650 – 850  ≥ 35  ≤ 260  ≥ 45  ≥ 40

HEAT TREATMENT

Solution annealing at min 1150°C followed by water quenching

WELDABILITY

Very good.

1.4547 / UNS S31254 / 6MO ROUND BAR / F44 / SMO 254 ROUND BAR

DESCRIPTION KG/M DESCRIPTION KG/M
10 mm 0.7 120 mm 92.3
12 mm 1. 130 mm 108.1
16 mm 1.7 140 mm 125.4
20 mm 2.6 150 mm 144
25 mm 4. 160 mm 161
30 mm 5.8 170 mm 186
32 mm 6.6 180 mm 208
35 mm 7.9 200 mm 256
40 mm 10.3 210 mm 286
50 mm 16. 220 mm 308
60 mm 23. 230 mm 343
65 mm 27. 250 mm 393
70 mm 31.2 270 mm 467
75 mm 36.1 280 mm 503
80 mm 41.2 300 mm 577
90 mm 51.9 325 mm 687
100 mm 64.1 350 mm 796
110 mm 76.1 380 mm 939
115 mm 85.9 400 mm 1028

1.4547 / UNS S31254 / 6MO / F44 / SMO 254 PLATES

DESCRIPTION KG/PLATE DESCRIPTION KG/PLATE
1 x 1250 x 2500 mm 25 12 x 1500 x 3000 mm 445
1,5 x 1500 x 3000 mm 54 12 x 1500 x 6000 mm 890
2 x 1500 x 3000 mm 72 12 x 2000 x 6000 mm 1187
3 x 1500 x 3000 mm 108 15 x 1500 x 3000 mm 557
3 x 1500 x 6000 mm 216 15 x 1500 x 6000 mm 1113
3 x 2000 x 6000 mm 288 15 x 2000 x 6000 mm 1484
4 x 1500 x 3000 mm 144 20 x 1500 x 3000 mm 742
4 x 1500 x 6000 mm 288 20 x 1500 x 6000 mm 1484
4 x 2000 x 6000 mm 384 20 x 2000 x 6000 mm 1978
5 x 1500 x 3000 mm 180 25 x 1500 x 3000 mm 927
5 x 1500 x 6000 mm 360 25 x 1500 x 6000 mm 1854
5 x 2000 x 6000 mm 480 25 x 2000 x 6000 mm 2472
6 x 1500 x 3000 mm 216 30 x 1500 x 3000 mm 1113
6 x 1500 x 6000 mm 432 30 x 1500 x 6000 mm 2225
6 x 2000 x 6000 mm 576 30 x 2000 x 6000 mm 2967
8 x 1500 x 3000 mm 297 40 x 1500 x 3000 mm 1484
8 x 1500 x 6000 mm 594 40 x 1500 x 6000 mm 2967
8 x 2000 x 6000 mm 791 40 x 2000 x 6000 mm 3956
10 x 1500 x 3000 mm 371 50 x 1500 x 3000 mm 1854
10 x 1500 x 6000 mm 742 50 x 1500 x 6000 mm 3708
10 x 2000 x 6000 mm 989 50 x 2000 x 6000 mm 4944

Description

EN symbol (short) X1CrNiMoCuN20-18-7
UNS S 31254
AFNOR X1CrNiMoCuN20-18-7 / NF EN 10217-7 (02/2005) (FR)
BS X1CrNiMoCuN20-18-7 / B.S.EN 10217-7 (02/2005) (GB)
Registered work's label 254 SMO®
Density kg/dm3 8,0
Hardness HB <= 360
Composition chromium nickel molybdenium steels
Category Stainless steels
Structure austenitic
Corrosion resistant to intercrystalline corrosion
satisfactionary against pitting corrosion
high corrosion resistance

Chemical Composition

  C Si Mn S N Cr Cu Mo Ni P
1.4547 Min %         0,18 19,50 0,50 6,00 17,50  
Max % 0,020 0,70 1,00 0,010 0,25 20,50 1,00 7,00 18,50  
(Key to steel 2010)
S 31254 Min %         0,18 19,50 0,50 6,00 17,50  
Max % 0,20 0,80 1,00 0,010 0,22 20,50 1,00 6,50 18,50 0,030
ASTM A 312 (S 31254)

Physical properties

Property Value
Density: kg/dm3 8,0
Hardness: HB <= 360
magnetizable no
impact work (ISO-V) (J) >100
Temperature T
°C/F
(°C/F)
Specific heat
J / kgK
(Btu / lb °F)
Thermal conductivity
W/mK
(Btu·in / ft2·h·°F)
Electric resistance
µΩ · cm
(Ω circ mill / ft)
Modulus of elasticity 
kN/mm2
(103 ksi)
Expansion rate from 70°F bis T
10-6 / K
(10-6 / °F)
20 / 68 500 (--) 13 (--) 0,85 (--)    
100 / 212 520 (--) 14 (--) 0,90 (--)   16,0 (--)
200 / 392 540 (--) 15 (--) 0,95 (--)   16,0 (--)
300 / 572 555 (--) 17 (--) 1,03 (--)   16,5 (--)
400 / 752 570 (--) 18 (--) 1,10 (--)   17,0 (--)
Temperature 1,0% Yield strength 

in high temperatures
°C / °F Rp 1,0
N/mm2 / ksi
100 / 212 270 / 39,1
200 / 392 225 / 32,6
300 / 572 200 / 29,0
400 / 752 190 / 27,5
500 7 932 180 / 26,1
ksi value calculated

Mechanical properties (20°C / 68°F)

1,0 % Yield strength (Mpa) / (ksi) 340 / 49,3
0,2 % Yield strength (Mpa) / (ksi) 300 /43,5
Tensile strength Rm (Mpa) /(ksi) 650-850 / 94-123
Elongation A5 (%) 35
impact work ISO-V (J) 70

Temparature information

Application area
Operation temperature  ºF  to 752 ºF  operating temperature limit
Solution heat treatment
Working temperature 2102 ºF  to 2192 ºF 
Explanation report cool down:water
Solution heat treatment
Working temperature 1832 ºF  to 2102 ºF 
Explanation report cool down: air

Standards / information

Standards Desciption
ASTM A 213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler,Superheater,and Heat-Exchanger Tubes
ASTM A 312 Standard Specification for Seamless and welded austenitic stainless steel pipes
DIN EN 10088-1 (09/2005) Stainless steels Part 1: List of stainless steels
DIN EN 10088-3 (09/2005) stainless steels.Technical delivery conditions for semi-finished products,bars,rods,wire selection and bright products of corrosion resisting steels for general and construction purposes
DIN EN 10217-7 Welded steel pipes under compression load Pipes made from stainless steel
DIN EN 10297-2 (02/2006) Welded circular steel pipes for machine construction and general technical service stainless steel. Pipes made from stainless steel
VdTÜV / Werkstoffblatt 473 Austenitic steel X1 CrNiMoCu 20 18 7

Process information

Chip removing process process in annealed state
Welding
 - Material classification acc. CEN ISO/TR 15608 8.2
 - Type well weldable
 - Add. material NiCr20Mo9Nb

Main fields of application

Details of application
Certifications
Chemical Industry
petrochemical industry
Flue gas desulphurisation plants
cellulose/paper industry
sea and lake water plants

Range of products

Product type Product
Plates / Sheets plates/sheets 
plate/sheet cuts
Fittings welded elbows
welded reductions
Welded T-pieces
seamless elbows
seamless reductions
seamless T-pieces
Flanges / Collars / Flared tube ends weld neck flange/blind flange
Pipes / Tubes welded pipes/tubes
seamless pipes/tubes
Bar steel section steel 
round bar steel



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