SS304 2507 254smo Seamless Super Duplex Stainless Steel Pipe with Marine Service

• Customization: Available
• Type: Seamless
• Technique: Hot Rolled
• Model NO.: EZS
• Material: Stainless Steel
• Surface Treatment: Polished
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Standard: ASTM, AISI, DIN, En, GB, JIS, ASME SA213/ASTM A213
• Application: Decoration or Power Industry
• Length: 6m, 12m or Customized
• Inspections and Tests Performed: Ut,Rt,Et
• Delivery Condition: Annealed, Normalized,Normalized and Tempered
• 3-Rd Party Inspection: TUV,SGS,Ibr,BV etc
• Treatment: Pickled, Annealed, Polished
• End Type: Plain Ends, Bevel End, Threaded End
• Aplication 1: Industrial Heating and Drilling
• Aplication 2: Heat Exchanger
• Aplication 3: Metel Treatment System
• Aplication 4: High Temperature Geberater Tube
• Aplication 5: Boiler
• Transport Package: Wooden Box/ PVC Bags/ Steel Strips/Plastic Plates
• Specification: OD: 8-168.3mm, WT: 1-15mm
• Trademark: EZS
• Origin: China
• HS Code: 7304
• Production Capacity: 300000t/Year

Product Description

A312/A213 Seamless Stainless Steel Pipe (304 304H Tp304h , TP316L , 310S , 321.TP410 )

A312 Tp304H Stainless steel pipes have been qualified by ISO9001 (dual-certified by IQ Net and CQM), GL, DNV, BV, ABS and PED (TUV certificate for Pressure Vessel).

1. Item: SMLS Stainless Steel pipe, Stainless Steel Pipe, A213/312 Stainless Steel Pipe
2. OD: 1/8"-100" (6-2500mm)
3. WT: SCH10-SCHXXS (1-150mm)
4. Length: 5.8m, 6m, or as required
5. Package: Bundles, seaworthy wooden (Plywood) boxes or according to customers' requirements.

6. Application
A) General service industries (petroleum\military \food\ chemical\paper\ fertilizer\fabric\aviation and nuclear)
B) Fluid, gas and oil transport
C) Pressure and heat transmission
D) Boiler\pressure vessel\heat exchanger and condenser.

If you are really interested in our products, you can feel free to contact us directly. Your specific enquiry will be highly treated. We will quote you our most favorable price.

Specifications:
Shape : Round tube , Rectangular tube , Suare Tube , Section tube , Section pipe , Special Pipe 
O.D : DN4 , DN6 , DN8 , DN10 , DN15 ,DN20 , DN25 ,DN30 , DN40 , DN50 ,DN60 , DN70 , DN80 , DN90 , DN100 ,  DN150 , DN200 , DN250 , DN300 , DN350 , DN400 , DN450 , DN500 , DN550 ,DN600 , DN650 ,DN700 ,DN750 , DN800 , DN850 , DN900 .
THK : SCH5 , SCH5S , SCH10 ,SCH10S , SCH20 , SCH30 , SCHSTD , SCH40S , SCH40 , SCH60 , SCHXS , SCH80S , SCH80 , SCH100 , SCH120 , SCH140 , SCH160 ,SCHXXS 

Other size can be supplied as customers' requirement.
Surface: Matt, Pickling, bright, polished.
Standard: AISI, ASTM, GB, BS, DIN, JIS, etc.
Quality: Prime quality
Technique: Hot Rolled and Cold Rolled
Origin: China

Specification

(Stainless Steels for Corrosion & Heat Resistance)  

| Grade | UNS No. | Chemical Composition (Key Elements, %) | Mechanical Properties |
| TP304 | S30400     | 18Cr-8Ni (C≤0.08, Mn≤2.0) | Tensile: ≥515 MPa Yield: ≥205 MPa Elong.: ≥35% |
| TP304H| S30409     | 18Cr-8Ni (C 0.04-0.10) | Same as TP304 but higher creep strength |
| TP316 | S31600     | 16Cr-12Ni-2Mo (C≤0.08) | Tensile: ≥515 MPa Yield: ≥205 MPa Elong.: ≥35% |
| TP316H| S31609     | 16Cr-12Ni-2Mo (C 0.04-0.10) | Same as TP316 but higher creep strength |
| TP321 | S32100     | 18Cr-10Ni-Ti (C≤0.08, Ti≥5xC) | Tensile: ≥515 MPa Yield: ≥205 MPa Elong.: ≥35% |
| TP321H| S32109     | 18Cr-10Ni-Ti (C 0.04-0.10) | Same as TP321 but higher creep strength |
| TP347 | S34700     | 18Cr-10Ni-Nb (C≤0.08, Nb≥10xC) | Tensile: ≥515 MPa Yield: ≥205 MPa Elong.: ≥35% |
| TP347H| S34709     | 18Cr-10Ni-Nb (C 0.04-0.10) | Same as TP347 but higher creep strength |
| S31025 (Super 304H) | S31025 | 18Cr-9Ni-3Cu-Nb (C 0.07-0.13) | Tensile: ≥590 MPa Yield: ≥240 MPa Elong.: ≥35% |
| S31254 (6Mo Super Austenitic) | S31254 | 20Cr-18Ni-6Mo-0.2N (C≤0.02) | Tensile: ≥650 MPa Yield: ≥300 MPa Elong.: ≥35% |

ASTM A213/A213M Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes

Scope  
ASTM A213/A213M is a standard specification for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. It applies to high-temperature service in power plants, refineries, and similar industries.

Certification & Marking

- Mill test reports (MTRs) must include chemical, mechanical, and test results.  
- Marking: ASTM standard, grade, heat number, size, manufacturer's name.

 

ASTM A312 TP304

ASTM A213 TP316L

ASTM A213 TP410

Stainless Steels for Corrosion & Heat Resistance

| Grade | UNS No. | Chemical Composition (Key Elements, %) | Mechanical Properties |
| TP304 | S30400     | 18Cr-8Ni (C≤0.08, Mn≤2.0) | Tensile: ≥515 MPa Yield: ≥205 MPa Elong.: ≥35% |
| TP304H| S30409     | 18Cr-8Ni (C 0.04-0.10) | Same as TP304 but higher creep strength |
| TP316 | S31600     | 16Cr-12Ni-2Mo (C≤0.08) | Tensile: ≥515 MPa Yield: ≥205 MPa Elong.: ≥35% |
| TP316H| S31609     | 16Cr-12Ni-2Mo (C 0.04-0.10) | Same as TP316 but higher creep strength |
| TP321 | S32100     | 18Cr-10Ni-Ti (C≤0.08, Ti≥5xC) | Tensile: ≥515 MPa Yield: ≥205 MPa Elong.: ≥35% |
| TP321H| S32109     | 18Cr-10Ni-Ti (C 0.04-0.10) | Same as TP321 but higher creep strength |
| TP347 | S34700     | 18Cr-10Ni-Nb (C≤0.08, Nb≥10xC) | Tensile: ≥515 MPa Yield: ≥205 MPa Elong.: ≥35% |
| TP347H| S34709     | 18Cr-10Ni-Nb (C 0.04-0.10) | Same as TP347 but higher creep strength |
| S31025 (Super 304H) | S31025 | 18Cr-9Ni-3Cu-Nb (C 0.07-0.13) | Tensile: ≥590 MPa Yield: ≥240 MPa Elong.: ≥35% |
| S31254 (6Mo Super Austenitic) | S31254 | 20Cr-18Ni-6Mo-0.2N (C≤0.02) | Tensile: ≥650 MPa Yield: ≥300 MPa Elong.: ≥35% |

Popular Industrial SS Grades

(Custom configurations available upon request.)

Grade	Type	C max	Cr	Ni	Mo	Others	T.S (MPa,max)	Y.S (MPa,min)	Elongation (%,min)
304	Austenitic	0.08	18-20	8-10.5	-	Mn(2%)Si(0.75)	515	205	40
304L	Austenitic	0.03	18-20	8-12	-	Low carbon	485	170	40
316	Austenitic	0.08	16-18	10-14	2-3	Improved C/R	515	205	40
316L	Austenitic	0.03	16-18	10-14	2-3	Low carbon	485	170	40
321	Austenitic	0.08	17-19	9-12	-	Ti (5x C min)	515	205	40
347	Austenitic	0.08	17-19	9-13	-	Nb+Ta	515	205	40
410	Martensitic	0.15	11.5-13.5	-	-	Mn(1%)Si(1%)	485	275	20
420	Martensitic	0.15-0.40	12-14	-	-	High carbon	586	345	15
430	Ferritic	0.12	16-18	-	-	Mn(1%)Si(1%)	450	205	22
2205	Duplex	0.03	21-23	4.5-6.5	2.5-3.5	N(0.14-0.20%)	620	450	25
2507	Duplex	0.03	24-26	6-8	3-4	N(0.24-0.32%)	800	550	15

Notes:

1. Composition values are in weight % (balance Fe).  
2. Mechanical properties are typical values (may vary with heat treatment).  
3. Austenitic grades (304, 316) are non-magnetic, corrosion-resistant, and ductile.  
4. Martensitic grades (410, 420) are hardenable by heat treatment.  
5. Ferritic grades (430) are magnetic with moderate corrosion resistance.  
6. Duplex grades (2205, 2507) offer high strength and corrosion resistance. 

Item	Austenitic Stainless Steel	Duplex Stainless Steel
Typical Grades	304, 316L, 310S, 321, 317L	2205 (S32205), 2507 (S32750), S32304
Microstructure	Full austenite (γ phase)	Mixed austenite + ferrite (duplex structure)
Magnetic Property	Non magnetic or weakly magnetic	Magnetic
Pitting Resistance Equivalent (PREn)	304: ~18316L: ~24	2205: ~342507: ~43
Corrosion Resistance	Good general corrosionGood chloride stress corrosion cracking (SCC) resistance	Superior pitting, crevice and chloride SCC resistanceBetter in harsh seawater/brine environments
Mechanical Strength	Moderate tensile & yield strength	Much higher yield strength (≈ 2× of austenitic)
Toughness & Ductility	Excellent ductility, formability, toughness	Good toughness but less ductile than austenitic
Thermal Conductivity	Relatively low	Higher than austenitic
Thermal Expansion	High coefficient of thermal expansion	Lower thermal expansion
Weldability	Excellent, widely weldable	Weldable but requires precise heat control to maintain duplex structure
Machining	Relatively easier	Harder, more abrasive machining
Price Level	Lower (standard material)	Higher (alloyed with Mo, N, higher production cost)
Typical Applications	Food equipment, piping, tanks, heat exchangers, general industry	Seawater systems, desalination, oil & gas, chemical processing, high chloride environments

Method	ECT	UT (Ultrasonic)	PT (Penetrant)
Defect Type	Surface/near-surface	Internal & surface	Surface only
Depth	0–3 mm	Full wall thickness	Surface only
Speed	Very high (automated)	Medium	Slow
Couplant	None	Required	Required (chemicals)
Best For	High-speed in-line, thin-wall tubes	Thick-wall, internal flaws	Complex geometries, surface cracks

Company Profile

EZ Steel Industrial Co., Ltd

EZ Steel Industrial Co., Ltd is a leading manufacturer of high-performance industrial metal pipelines, specializing in alloy steel, carbon steel, stainless steel, and copper-nickel-based alloy products. With strategically located facilities in Cangzhou, Yangzhou, and Lishui, we deliver globally trusted piping solutions that combine cutting-edge technology, rigorous quality control, and unmatched expertise.

Hydrostatic Pressure Test of Stainless Steel Pipe

ECT (Eddy Current Testing) 

All stainless steel pipes undergo strict hydrostatic pressure testing before delivery. 
Under specified test pressure, the pipes are held for a certain period to ensure no leakage, deformation or damage, 
guaranteeing air tightness, pressure resistance and service safety for fluid transportation, pressure systems and engineering applications.

Core Principle
Based on electromagnetic induction:
A high-frequency AC current flows through a coil (probe), generating an alternating magnetic field.
This field induces eddy currents on the surface and near-surface of the conductive stainless steel pipe.
Defects (cracks, corrosion, pits) or material variations disrupt the eddy current flow, altering the coil's impedance.
The instrument detects these impedance changes, signaling the presence of a defect

FAQ

Q: What's your minimum order quantity?
A: Our minimun quantity is 500 Kg. We also can offer you samples.
Q: What's your delivery time?
A: Our normal delivery time is 7-30 days, and it depends on your quantity and items. Of course, if you need products urgently, we also will consider arranging it firstly.
Q: What's the price of your product?
A: Our prices are based on the material grade, size, quantity and physical performance etc. So if you can offer us the detailed information, then we can give you the best reasonable price. Also, we can do special size and color for customers.
Q: What's your after-sales service?
A: We have two ways to handle claims by replacement and deduction. Of course, if the materialis not good used by wrong parameter from customer, we won't be responsible.
Q: Why do you think I will want to buy from you?
A: We have advantages with 25 years of professional experiences in manufacturing & designing, advanced technology & the first-class equipment, perfect logistics management, high-quality after-sales service and competitive price.