ASTM A312 UNS S31254 (254SMO) high-molybdenum stainless steel pipe tube

Product Description

 

Product Description

254SMO Tubing, also known as S31254, X1CrNiMoCuN20-18-7, Alloy 6Mo, or 1.4547, complies with standards such as ASME SA213, ASTM A213, ASTM A269, and EN 10216-5. It is a superaustenitic stainless steel designed for maximum resistance to pitting and crevice corrosion. With high levels of chromium, molybdenum, and nitrogen, 254SMO is especially suited for high-chloride environments such as brackish water, seawater, pulp mill bleach plants, and other high-chloride process streams. 254SMO pipe offers chloride resistance superior to that of Alloy 904L, Alloy 20, Alloy 825, and Alloy G. The addition of copper improves corrosion resistance in certain acidic environments. In addition, due to its high content of nickel, chromium, and molybdenum, 254SMO (S31254) tubing exhibits excellent stress corrosion cracking resistance.

Other key characteristics of ASTM A312 254SMO include:

- Excellent resistance to pitting and crevice corrosion
- High weldability and formability
- Good workability and machinability
- High strength and toughness at both ambient and elevated temperatures
- Low thermal expansion coefficient and good thermal conductivity

Product Name	Stainless Steel Seamless Pipes /Tubes 254SMO S31254 Труба Сталь конструкционная криогенная 254SMO S31254 Tubería de acero inoxidable sin costura 254SMO S31254 Tubos de Aço Inoxidável sem Costura 254SMO S31254 Tubo INOXIDABLE Sch. cédula 40 x L = 6 metros SIN COSTURA ASTM A-312 Grado 254SMO S31254
Company Inform	1.Name:WENZHOU GUOHAO STEEL., LTD   2.Type: Manufacturer
Material	S31254, X1CrNiMoCuN20-18-7, Alloy 6Mo, or 1.4547
Standard	ASTM A312,ASTM A213,ASTM A269
Specification	D(Outer Diameter)	6mm-630mm ; 1/8inch-24inch
	T(Wall Thickness)	0.89mm-40mm SCH 5, SCH 10, SCH 40, SCH 80, SCH 160, SCH XXS 10 BWG, 12 BWG, 14 BWG , 16 BWG, 18 BWG, 20 BWG 10 SWG, 12 SWG, 14 SWG , 16 SWG, 18 SWG, 20 SWG
	L(Length)	Random length 5~7m Fixed length 6m /6.096m /6.1m/12m  or as customer's actual request
Surface	Annealing&Pickling Polishing(180#-600#) Bright Annealing Sand Blasting Shot Blasting
Pipe End	Plain End (PE) Bevelled End (BE) Threaded End (TE)
Markings	GH-STEEL S.S SML PIPE ASTM A312 S31254 3" SCH40 HEAT NO.*********** ET Markings will adhere to prescribed specifications in A999/A999M and shall include the NPS or OD and schedule number or average wall thickness, heat number, and NH (when hydrotesting is not performed) and ET (when eddy-current testing is performed) or UT (when ultrasonic testing is performed). The marking shall also include the manufacturer's private identifying mark, the marking requirement of section 12.3 on Hydrostatic or Nondestructive Electric Test, if applicable, and whether seamless (SML), welded (WLD), or heavily cold-worked (HCW). For Grades TP304H, TP316H, TP321H & TP347H, the marking shall also include the heat number and heat-treatment lot identification.
Flattening Test	For material heat treated in a continuous furnace flattening tests shall be made on a sufficient number of pipes to constitute 5% of the lot, but in no case less than 2 lengths of pipe.
Hydrostatic or Nondestructive Testing	Each pipe shall be subjected to the nondestructive electric test or the hydrostatic test
Value Added Services	Customize Length, Bending, Polishing, Shot Blasting, Drilling/Punching, Degreasing
Delivery Time	For ready stock :7 days after receiving the deposit of T/T For MTO: 35 days after receiving the  deposit of T/T
Trade Terms	EXW,FOB, CFR, CIF etc.
Loading Port	Ningbo/Wenzhou/Shanghai
Remittance method	TT/LC/CASH
Container	20ft GP:5898mm(Length)x2352mm(Width)x2393mm(High) 24-26CBM 40ft GP:12032mm(Length)x2352mm(Width)x2393mm(High) 54CBM  40ft HC:12032mm(Length)x2352mm(Width)x2698mm(High) 68CBM

 

Product Parameters

Chemical Composition for S31254 254SMO stainless steel seamless tubes pipes

Grade	%	Ni	Cr	Mo	Cu	N	C	Mn	Si	P	S
S31254	Min.	17.5	19.5	6	0.5	0.18	-	-	-	-	-
S31254	Max.	18.5	20.5	6.5	1	0.22	0.02	1	0.8	0.03	0.01

Mechanical Properties for S31254 254SMO stainless steel seamless tubes pipes

Status			Tensile strength		Yield strength		Elongation A5 %
			min ksi (Mpa)		min ksi (Mpa)
S31254 T≤0.187in. (5mm)			98 (675)		45 (310)		35
S31254 T>0.187in. (5mm)			95 (655)		45 (310)		35

Physical properties for S31254 254SMO stainless steel seamless tubes pipes

Density		Melting point		Specific Heat 0-100°C ( J/kg.K)		Thermal Conductivity at 20°C Btu/h ft ºF		Elastic Modulus (GPa)		Electrical resistivity [μΩ . cm]
8 g/cm3 0.289 lb/in3		1320-1390°C		500 J.kg-1.°K-1		14 W/mK  97.2 BTU in/hr.ft².°F		195 Gpa 28300 Ksi		8.5 μohm/cm

Equivalent Grade for S31254 254SMO stainless steel seamless tubes pipes

Grade	UNS	WERKSTOFF NR.		EN		US
254SMO	S31254	1.4547		X1CrNiMoN20-18-7		ASTM A479/A473, /A240 S31254 F44

Corrosion resistance for S31254 254SMO stainless steel seamless tubes pipes
254SMO S31254 tubing has a very low carbon content, which significantly reduces the risk of carbide precipitation during heating. As a result, the material remains resistant to intergranular corrosion even after one hour of sensitization at temperatures between 600-1000°C, and is capable of passing the Strauss intergranular corrosion test (ASTM A262 Practice E). However, due to its high alloy content, there is a possibility of intermetallic phase precipitation at grain boundaries within the aforementioned temperature range. Although these precipitates do not typically lead to intergranular corrosion under normal corrosive conditions and welding operations, they may increase susceptibility to intergranular corrosion in the heat-affected zone when exposed to concentrated HNO3 . In chloride-, bromide-, or iodide-containing environments, ordinary stainless steels are prone to localized corrosion phenomena such as pitting, crevice corrosion, or stress corrosion cracking. In some cases, the presence of halides may also accelerate uniform corrosion.
254SMO S31254 tubing exhibits particularly strong corrosion resistance in non-oxidizing acids. In pure sulfuric acid, it offers significantly better corrosion resistance than 316 stainless steel (a common grade), although its resistance is somewhat lower than that of 904L (N08904) stainless steel at high concentrations. In sulfuric acid containing chloride ions, however, 254SMO S31254 demonstrates the highest corrosion resistance among these alloys.
316 stainless steel is generally unsuitable for use in hydrochloric acid due to the risk of both localized and uniform corrosion. In contrast, 254 SMO S31254 tubing can be used in diluted hydrochloric acid under normal temperature conditions, and corrosion is typically not a concern within this range. Nevertheless, efforts should be made to avoid crevice corrosion.
In fluoride-containing environments such as H2SiF6 and HF, the corrosion resistance of conventional stainless steels is severely limited. However, 254SMO S31254 tubing maintains excellent corrosion resistance across a wide range of temperatures and acid concentrations.

Hot Working for S31254 254SMO stainless steel seamless tubes pipes 
Hot working should be performed within the temperature range of 1000-1200°C. Exceeding this range may negatively affect workability. Significant surface scaling typically occurs at temperatures above 1150°C. To ensure complete dissolution of any secondary phase precipitates formed during hot working, a subsequent heat treatment at a minimum temperature of 1150°C is recommended. Following this treatment, the material should be cooled as rapidly as possible. A slow cooling rate may lead to a reduction in corrosion resistance.  

Cold Working for S31254 254SMO stainless steel seamless tubes pipes
254SMO pipe exhibits excellent cold formability. Forming operations such as bending and pressing can be performed without significant difficulty during fabrication. Practical experience gained from the pressing of heat exchanger plates has been highly favorable. The material demonstrates a tendency to rapidly work harden during processing.

Welding property  for S31254 254SMO stainless steel seamless tubes pipes
254SMO alloy possesses good weldability.  When delivered, stainless steel sheets and plates have a homogeneous composition.  Remelting of the parent metal, such as during welding without filler metal, may cause microscale variations in composition for elements such as chromium, nickel and particularly molybdenum.  This phenomenon occurs in all highly alloyed stainless steels.  These variations may reduce the pitting resistance of the weld.   GTA and plasma arc welding without filler metal should therefore be avoided.
The material may not be subjected to abrasive contact with copper/brass items.  Penetration of copper/brass into the grain boundaries can give rise to crack formation.
Avesta P12 or P16 welding consumables should be used for all welding methods.
Ignite the electrode in the joint since ignition burns beside the weld can give rise to corrosion attacks.
Heat treatment is normally not necessary after welding.  However, welding without filler metal should be followed by solution annealing at 1150-1200°C and subsequent rapid cooling in order to achieve the best possible corrosion resistance.
To ensure optimum corrosion resistance the welds should be cleaned, preferably by pickling.
Standard Tolerance for 254SMO S31254 stainless steel seamless tubes pipes

Standard	Outside Diameter Tolerance(mm)		Thickness Tolerance(mm)		Length Tolerance (mm)
ASTM A269	D<12.7	±0.13	±15%		+3.2 / -0
	(12.7~38.1]	±0.13	±10%
	[38.1~88.9)	±0.25			+4.8 / -0
	[88.9~139.7)	±0.38
	[139.7~203.2)	±0.76
ASTM A213	D<25.4	±0.1	D≤38.1	+20%/ -0%	D≤50.80	+3 / -0
	[25.4~38.1]	±0.15
	(38.1~50.8)	±0.2	D>38.1	+22%/ -0%	D>50.8	+5 / -0
	[50.8~63.5)	±0.25
	[63.5~76.2)	±0.30
	[76.2~101.6]	±0.38
	(101.6~190.5]	+0.38  / -0.64
	(190.5~228.6]	+0.38  / -1.14
ASTM A312	[10.29~48.26]	+0.4  / -0.8	10.3~73	+20% / -12.5%	+6 / -0
			88.9~457 T/D≤5%	+22.5% / -12.5%
	(48.26~114.30]	±0.80	88.9~457 T/D>5%	+15% / -12.5%
	(114.30~219.08]	+1.6  / -0.8	508above T/D<5%	+22.5% /-12.5%
	(219.08~457.20]	+2.4  / -0.8	508above T/D>5%	+15%/-12.5%

Packaging & Shipping

1. All of our stainless steel seamless pipe & tubes are packaged as per international standard to prevent any possible damage or loss. By default, we will use thick woven plastic bag to bundle the finished pipes together in batches.
2. For some special pipes & tubes that are vulnerable to dirt, scratches, stress or rough handling, we will suggest wooden case for protection. Kindly note, wooden case can incur extra cost, not only its own cost, but also the increased freight cost, which is especially true for air transportation.
3. For enhanced customer experience, we also provide dedicated package as per your special requirements.

Certifications

The inspection of our company and products is open to customers themselves or their designated third-party inspectors, such as SGS, BV, TUV, DNV, etc., who are well-known in the industry.
We provide Manufacturer TC (Test Certificate) in accordance to EN 10204/3.1B, Raw Materials Certificate, HT/DNT Test Report, Third Party Inspection Report.
• EN 10204/3.1B
• Raw Materials Certificate
• HT/NDT Test Report
• Third Party Inspection Report
Material Testing: We ensure that all our materials go through strict quality tests before dispatching them to our clients.
• Mechanical Testing
• Hardness Test
• Chemical Analysis - Spectro Analysis
• Positive Material Identification - PMI Testing
• Flattening Test
• Flaring Test
• Intergranular Corrosion (IGC) Test

PRODUCT APPLICATION

The most corrosion-resistant stainless steels contain molybdenum in the range of 6% to 7.3%. An example is the 254SMO alloy, which is commonly used in applications such as power plant condensers, subsea pipelines, and critical components of nuclear power plants, including industrial water piping systems.
1. Petroleum, petrochemical equipment, petro-chemical equipment, such as the bellows.
2.Pulp and paper bleaching equipment includes components such as digesters, bleaching towers, washing filters, barrels, and pressure rollers used in the processing cylinders.
3. Power plant flue gas desulfurization equipment - the main components include the absorption tower, flue, shut-off plate, internal parts, and spray system.
4. In marine or seawater processing systems, such as thin-walled condensers used in power plants for seawater cooling, and desalination equipment, the material can still be applied even under conditions where water flow within the system is limited or absent.
5. Desalination industries, such as salt or desalination equipment.
6. Heat exchanger, in particular in the working environment of chloride ion.
7. Hydraulic Tubing and instrumention tubing
8. Tanks and pipelines for chemicals with high halide contents

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Company Profile

Wenzhou Guohao Steel was established in 2008. We are ISO 9001:2015 approved manufacturer, having a state-of-the-art infrastructure facility for having smooth production process. It has successfully grown by focusing on serving customers across a range of high technology industries. One of our company strengths is its people, with many colleagues having been with the company from the beginning. This provides our customers with the benefit of a wealth of experience and industry knowledge. Guohao Steel now has the whole of manufactured stainless steel products to add to its already large range of High Performance Nickel Alloys.
Guohao Steel adhere to the high standards of integrity and compliance required, including:

1. Environmental standards
2. Health and safety standards
3. Ethical trading standards
4. Export compliance requirements

We now stock and have direct access to a wide range of other materials, including stainless steels and nickel alloys. We supply and process pipes for numerous key industry sectors, collaborating with both small businesses and large international manufacturers across various countries. Due to our reputation for quality, reliability, and industry approvals, we are a well-regarded supplier in diverse sectors. Our delivery of long-term tangible benefits enables our customers to compete in today's challenging global marketplace.
In order to achieve our goals, we are improving our facilities and expanding our machinery to offer broader processing capabilities. Additionally, our investment extends to the growth and development of our teams, which represent our most valuable resource. We aim for our customers to receive the best experience and trust in the expertise, knowledge, and experience of our teams. As we continue looking towards the future, we rely on our core values to guide both decisions and actions.

 

Our Advantages

1.More than 16 Years of Experience in Stainless Steel Production.
2.Provides cost-effective products and professional services to you.
3.We offer an extensive range of stainless steel, super duplex steel,nickel alloy.

FAQ

1.Q: Do you provide customized product services?
A: Of course, we can design and produce the products you need based on your specifications and drawings. For example: special dimensions, special controls, OEM, etc.

2.Q: Are you a manufacturer or trader?
A: We are manufacturers. We have our own factory to produce and process various kinds of stainless steel /nickel alloy pipes.

3.Q: Can we get the some samples?Is there a charge?
A: Yes, we will provide you with the samples you want. The samples are free of charge, but the customer may have to pay the freight.

4.Q: Can we visit your factory?
A: Of course, we welcome you to visit our factory on-site or visit our production line through online videos to learn more about our strength and quality. Once we have your schedule, we will arrange a professional sales team to follow up with you.

5.Q: How do you ensure the quality of the product?
A: All products must undergo three inspections throughout the entire manufacturing process, including production, cutting, and packaging. The factory inspection report is provided with the goods. If necessary, third-party inspections such as SGS can be accepted.

6.Q: What is your delivery time?
A: Different products and procurement quantities have different delivery times. The product will be delivered as soon as possible on the basis of quality assurance. Usually, if the goods are in stock, it takes 3-10 days. Alternatively, if the goods are out of stock, it will take 25 to 45 days.

7.Q: Can you arrange shipment?
A: Of course, we have freight forwarders who have been cooperating for many years. We are VIP and can provide you with the most favorable prices and professional services.

8.Q: What if I don't have import experience?
A: We have rich export experience. As long as you have an import license, please leave the rest to us! We will help you choose the most suitable transportation service to safely and accurately deliver the product to the place where it is needed.