254 Smo Tube A312/A269 S31254 (254Mo) 6-Moly Pipe

• Customization: Available
• Application: Chemical Industry, Oil and Gas Industry
• Certification: CE, ISO9001
• Model NO.: 254 Smo
• Length: 100 feet
• Material: 254 Smo
• Outer Diameter: 1/2-40
• Type: Seamless Pipe
• Wall Thickness: Sch10- Sch160
• Size: 1/2" - 40"
• Loading Port: Chinese Main Port
• Delivery Time: 7-30 Days Ex Mill
• Payment: L/C T/T
• Transport Package: Standard Sea-Worthy Package
• Specification: 2"~64"
• Trademark: Kingmetal
• Origin: China
• Production Capacity: 20000 Ton/Tons / Month

Product Description

254 SMO / UNS S31254 Tube

Specification
 

254 SMO is a high-alloy austenitic stainless steel developed for use in seawater and other aggressive chloride-bearing media. The steel is characterized by the following properties:

• Excellent resistance to pitting and crevice corrosion, PRE = ≥42.5*
• High resistance to general corrosion
• High resistance to stress corrosion cracking
• Higher strength than conventional austenitic stainless steels
• Good weldability

*The PRE is defined as, in weight-%, PRE = %Cr + 3.3 x %Mo + 16 x %N

Trademark information: 254 SMO is a trademark owned by Outokumpu OY.

Standards

• UNS: S31254
• EN Number: 1.4547
• EN Name: X1CrNiMoCuN20-18-7
• W.Nr.: 1.4529**
• AFNOR: Z1 CNDU 20.18.06AZ*

* Obsolete. Replaced by EN.
** Nearest equivalent grade.

Product standards

• Seamless tube and pipe: ASTM A269, A213, A312, NFA 49-217, EN 10216-5
• Norsok MDS R11/R18, IOGP S-563 MDS IR111/111S/IR118/IR118S
• Welded tube and pipe: ASTM A249, A269 , A312, A358, A409
• Fittings: ASTM A182
• Bar: ASTM A276, A479, EN 10088-3
• Forged products: ASTM A473

Approvals

• UNS S31254 (Alleima® 254 SMO) in the form of seamless pipe has been approved by the American Society of Mechanical Engineers (ASME) for use according to ASME Boiler and Pressure Vessel Code section VIII, div. 1. However, there is no approval for UNS S31254 in the form of seamless tube, but according to the ASME paragraph UG-15 it is allowed to use the design values for seamless pipe according to ASME section VIII, div. 1 also for seamless tube.
• NACE MR 0175 (sulphide stress cracking resistant material for oil field equipment).

Chemical composition (nominal)

Chemical composition (nominal) %

C	Si	Mn	P	S	Cr	Ni	Mo	N	Cu
≤0.020	≤0.80	≤1.00	≤0.030	≤0.010	20	18	6.1	0.20	0.7

 

Applications

Alleima 254 SMO is used in the following applications:

• Equipment for handling of seawater, such as seawater cooling, cooling water pipes, ballast water systems, firefighting systems etc.
• Hydraulic and instrumentation tubing
• Equipment in pulp bleaching plants
• Components in gas cleaning systems
• Tanks and pipelines for chemicals with high halide contents

Trademark information: 254 SMO is a trademark owned by Outokumpu OY.

Corrosion resistance

In solutions containing halides such as chloride and bromide ions, conventional stainless steels can be readily attacked by local corrosion in the form of pitting corrosion, crevice corrosion or stress corrosion cracking (SCC). In acid environments, the presence of halides also accelerates general corrosion.