Astm A790 / A789 UNS S31803 Duplex Pipe Tube

ASTM A789 / ASTM A790 UNS S31803 DUPLEX PIPE TUBE BRIEF INTRODUCTION

ASTM A790 Uns s31803 / ASTM A789 Uns S31803 duplex pipe tube is a stainless steel tube with good chloride stress resistance, Uns s31803 contains 21% Chrome 4.5% nickel and 2.5% molybdenum.

‌ASTM A790 S31803‌ Is Duplex stainless steel (austenitic-ferritic) with 22% Cr, 5% Ni, 3% Mo, and 0.15% N, offering high strength/pitting resistance for welded/seamless tubing.

ASTM A789 UNS S31803‌ Is Austenitic-ferritic duplex stainless steel (22% Cr, 5% Ni, 3% Mo, 0.15% N) for seamless/welded mechanical tubing, offering superior pitting/crevice corrosion resistance in aggressive environments‌

ASTM A789 / ASTM A790 Uns S31803 duplex pipe tube is duplex stainless steel pipe and a medium alloy duplex stainless steel with good chloride stress resistance. Medium alloy type – the representative grade is UNS S31803 (22Cr-5Ni-3Mo-0.15N); S31803 duplex steel pipe is in three kinds of dual phase steel (2205 duplex stainless steel pipe, 2507 duplex stainless steel pipe, S31803 duplex stainless steel seamless tube) is the most widely used.

Name ASTM A789 / ASTM A790 UNS S31803 Duplex pipe tube     Material: Duplex Stainless steel

Properties: Good chloride resistance stress Representative   grade: UNS S31803 / UNS S32205 / SAF 2205

Brand: KCM Special Steel

ASTM A790 UNS S31803 Is Standard for Seamless and Welded Ferritic-Austenitic Stainless Steel Pipe

ASTM A789/ASTM A790 UNS S31803 Duplex Pipe/Tube supplier and manufacturer in CHINA, contact us to get High performance SA789/SA790 UNS S31803 duplex pipe/tube for marine applications.

ASTM A790 UNS S31803 Pipe Scope of application

1.1 This specification2 covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

1.2 Optional supplementary requirements are provided for pipe when a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and, when desired, one or more of these may be specified in the order.

1.3 Appendix X1 of this specification lists the dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the M designation of this specification is specified in the order.

NOTE 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as nominal diameter, size, and nominal size.

What Is ASTM A790 UNS S31803 Pipe?

ASTM A790 UNS S31803 Pipe & tube is a duplex stainless steel. 22% chromium duplex ( austenitic/ferritic ) steel ( type 2205 / UNS S32205 ) with moderate to high strength and good resistance to common corrosion/stress, corrosion/cracking.

The alloy of ASTM A790 UNS S31803 Pipe & tube is resistant to chloride environments and sulfide stress corrosion and is approximately twice as strong as standard austenitic stainless steels. This alloy can be successfully used as a replacement for 300 series austenitic stainless steels when higher mechanical strength/lower weight is required. The F51 is easy to weld with many standard arc welding equipment, but is not recommended for oxy-ethylene block welding due to the potential for carburization of the weld metal.

ASTM A789/ASTM A790 UNS S31803 Duplex Pipe/Tube Supplier and manufacturer in CHINA, contact us to get high performance and reasonable price of sa789/sa790 uns s31803 duplex pipe/tube.

ASTM A789 / ASTM A790 UNS S31803 Pipe & tube Executive Standard

ASTM A789 / ASTM A790 UNS S31803 Chemical Composition:

‌Element‌	‌Content Range (wt%)‌
Carbon (C)	≤ 0.030
Silicon (Si)	≤ 1.00
Manganese (Mn)	≤ 2.00
Phosphorus (P)	≤ 0.030
Sulfur (S)	≤ 0.020
Chromium (Cr)	21.00–23.00
Nickel (Ni)	4.50–6.50
Molybdenum (Mo)	2.50–3.50
Nitrogen (N)	0.08–0.20
Copper (Cu)	≤ 0.50
Iron (Fe)	Balance

ASTM A789 / ASTM A790 UNS S31803 Physical Properties:

‌Property‌	‌Value Range‌
Tensile Strength	760–1000 MPa
Yield Strength	550–750 MPa
Elongation (at Break)	≥25%
Hardness (Brinell)	≤290 HB

ASTM A789 / ASTM A790 UNS S31803  Heat treatment: heat preservation between 1020-1100 ℃ for 1-2 hours, rapid air cooling or water cooling.

‌Process‌	‌Temperature Range‌	‌Cooling Method‌	‌Key Notes‌
‌Solution Annealing‌	1020–1100°C	Rapid cooling (e.g., water)	Essential to avoid prolonged exposure to brittle temperature ranges (475°C) ‌
‌Post-Weld Heat Treatment‌	Generally not required	—	Preheating and post-weld heat treatment are unnecessary for most applications ‌

ASTM A789 / ASTM A790 UNS S31803 Pipe & tube Mechanical properties:

‌Property‌	‌Value Range‌
‌Tensile Strength‌	620–1000 MPa ‌
‌Yield Strength (0.2% offset)‌	450–750 MPa ‌
‌Elongation (at Break)‌	≥25% ‌
‌Hardness (Brinell)‌	≤290 HB
‌Impact Energy (Charpy V-notch)‌	≥100 J (at 20°C) ‌

ASTM A790 UNS S31803 PIPE & TUBE (UNS S31803 stainless steel pipe) is an ultra-low carbon duplex stainless acid-resistant steel with excellent resistance to pitting and crevice corrosion. At the same time, nitrogen is a strong element that forms and stabilizes austenite. Even if it is welded or heated at high temperature, it can ensure that a certain amount of austenite exists in the structure. Single-phase ferrite. The two-phase ratio is not sensitive to changes in heating temperature.

ASTM A789 Is Standard for Seamless and Welded Ferritic / Austenitic Stainless Steel Tubing

Scope of application

1.1 This specification2 covers grades of average wall thickness, or, if specified on the order, minimum wall thickness, of stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Within the text, the SI units are shown in brackets. The inch-pound units shall apply unless the M designation of this specification is specified in the order.

Thickness Chart Of ASTM A789 / ASTM A790 UNS S31803 Pipes In Stock or for new production.

NPS	Outside Diameter		Wall Thickness			Weight	Weight
	in	mm	in	mm	Sched	kg/Mtr	Lb/ft
1/2″	0.840	21	0.109	2.769	40 STD	1.268	0.851
			0.147	3.734	80 STD	1.621	1.088
3/4″	1.050	27	0.113	2.870	40 STD	1.684	1.131
			0.154	3.912	80 STD	2.195	1.474
1″	1.315	33	0.133	3.378	40 STD	2.501	1.679
			0.179	4.547	80 STD	3.325	2.172
1 1/4″	1.660	42	0.140	3.556	40 STD	3.385	2.273
			0.191	4.851	80 STD	4.464	2.997
1 1/2″	1.900	48	0.145	3.683	40 STD	4.048	2.718
			0.200	5.080	80 STD	5.409	3.361
2″	2.375	60	0.154	3.912	40 STD	5.441	3.653
			0.218	5.537	80 STD	7.480	5.022
2 1/2″	2.875	73	0.203	5.516	40 STD	8.629	5.793
			0.276	7.010	80 STD	11.411	7.661
3″	3.500	89	0.216	5.486	40 STD	11.284	7.576
			0.300	7.620	80 STD	15.272	10.253
4″	4.500	114	0.237	6.020		16.073	10.790
			0.337	8.560		22.318	14.983
6″	6.625	168	0.188	4.775		19.252	12.924
			0.203	5.516		20.739	13.923
			0.219	5.563		22.318	14.983
			0.250	6.350		25.354	17.021
			0.280	7.112	40 STD	58.263	18.974
			0.312	7.925		31.334	21.036
			0.375	9.525		37.285	25.031
			0.432	10.973	80 XHY	42.561	28.573
			0.500	12.700		48.719	32.708
8″	8.625	219	0.188	4.775		25.233	16.940
			0.203	5.156		27.198	18.259
			0.219	5.563		29.286	19.661
			0.250	6.350	20	33.308	22.361
			0.277	7.036	30	36.786	24.696
			0.322	8.179	40	42.352	28.554
			0.375	9.525		49.216	33.041
			0.406	10.312	60	53.085	35.638
			0.500	12.700	80 XHY	64.627	43.388
10″	10.750	273	0.188	4.775		31.588	21.207
			0.219	5.563		36.689	24.631
			0.250	6.350	20	41.759	28.035
			0.307	7.798	30	51.002	34.240
			0.344	8.738		56.946	38.231
			0.365	9.271	40 STD	63.301	40.483
			0.438	11.125		71.852	48.238
			0.500	12.700	60 XHY	81.530	54.735
			0.594	15.088	80	95.969	64.429
12″	12.750	324	0.188	4.775		37.570	25.222
			0.219	5.563		43.657	29.309
			0.250	6.350		49.713	33.375
			0.281	7.137		55.739	37.420
			0.312	7.925		61.735	41.445
			0.375	9.525		73.824	49.562
			0.406	10.312		79.727	53.525
			0.500	12.700		97.438	65.415
			0.562	14.275		108.966	73.154
14″	14.000	356	0.188	4.775		41.308	27.732
			0.219	5.563		48.012	32.233
			0.250	6.350	20	54.685	36.713
			0.281	7.137		61.327	41.172
			0.312	7.925		67.939	45.611
			0.375	9.525	STD	81.281	54.568
			0.438	11.125	40	94.498	63.441
			0.500	12.700	XHY	107.381	72.090
			0.625	15.875		132.983	89.278
16”	16.000	406	0.188	4.775		47.290	21.748
			0.219	5.563		54.980	36.910
			0.250	6.350	10	62.639	42.053
			0.281	7.137		70.268	47.174
			0.312	7.925	20	77.866	52.275
			0.344	8.738		85.677	57.519
			0.375	9.525	30 STD	93.213	62.578
			0.438	11.125		108.433	72.797
			0.500	12.700	40 XHY	123.289	82.770
18″	18.000	457	0.219	5.563		61.948	41.588
			0.250	6.350		70.593	47.393
			0.281	7.137		79.208	53.176
			0.312	7.925	20	87.792	58.939
			0.375	9.525	STD	105.144	70.588
			0.438	11.125	30	122.369	82.152
			0.500	12.700	XHY	139.198	93.450
			0.562	14.275	40	155.904	104.666
			0.625	15.875		172.754	115.978
20″	20.000	508	0.250	6.350		78.547	52.733
			0.282	7.163		88.458	59.386
			0.312	7.925		97.719	65.604
			0.375	9.525	20 STD	117.075	78.598
			0.438	11.125		136.305	91.508
			0.500	12.700	30 XHY	155.106	104.130
			0.594	15.088	40	183.378	123.110
			0.625	15.875		192.640	129.328
			0.688	17.475		211.368	141.901
24″	24.000	610	0.250	6.350		94.456	63.413
			0.281	7.137		106.029	71.183
			0.312	7.925		117.573	18.932
			0.375	9.525	20 STD	140.938	64.618
			0.438	11.125		164.176	110.219
			0.500	12.700	XHY	186.923	125.490
			0.625	15.875		232.410	156.028
			0.688	17.475	40	255.148	171.293
			0.750	19.050		277.401	186.233
30″	30.000	762	0.250	6.350		118.318	79.433
			0.281	7.137		132.851	89.189
			0.312	7.925	10	147.353	98.925
			0.375	9.525	STD	176.731	118.648
			0.438	11.125		205.983	138.286
			0.500	12.700	20 XHY	234.647	157.530
			0.625	15.875	30	292.066	196.078
			0.688	17.475		320.817	215.380
			0.750	19.050		348.988	234.293
36″	36.000	914	0.250	6.350		142.180	95.453
			0.281	7.137		159.672	107.196
			0.312	7.925	10	177.133	118.918
			0.375	9.525	STD	215.525	142.678
			0.438	11.125		247.790	166.353
			0.500	12.700	20 XHY	282.372	198.570
			0.625	15.875		351.723	236.128
			0.688	17.475		386.487	259.467
			0.750	19.050		420.576	282.353
42″	42.000	1067	0.312	7.925		206.914	138.911
			0.375	9.525	STD	248.319	166.708
			0.500	12.700	XHY	33.097	221.610
			0.750	19.050		492.163	330.413
48″	48.000	1219	0.375	9.525	STD	284.112	190.738
			0.438	11.125		331.404	222.487
			0.500	12.700	XHY	377.822	253.650
			0.750	19.050		563.750	378.473
			0.875	22.225		655.969	440.383

Large quantity stock of ASTM A789/ASTM A790 UNS S31803 Duplex Pipe/Tube, KCM Special Steel Is SA789/SA790 uns s31803 duplex pipe/tube manufacturer & supplier in CHINA, contact us for more details now!

ASTM A790 / ASTM A789 UNS S31803 Pipe duplex Stainless Steel products scope

‌Product Type‌	‌Standard‌	‌Manufacturing Process‌	‌Key Applications‌	‌Properties & Advantages‌
‌Seamless Pipe/Tube‌	ASTM A790/A789, ASME SA-790/SA-789‌	Hot extrusion, cold drawing	Offshore pipelines, high-pressure oil/gas systems, geothermal energy systems‌	Superior strength (620–1000 MPa tensile), resistance to chloride stress corrosion‌
‌Welded Pipe/Tube‌	ASTM A790‌, ASME SA-790‌	TIG welding, laser welding	Chemical processing equipment, desalination systems, shipbuilding‌	Balanced ferrite-austenite microstructure, weldability with minimal intermetallic phases‌5
‌Pipe Fittings (Elbow, Tee, Reducer,Cross, Stub end)‌	ASTM A403‌, ASME B16.9‌, ASTM A815	Forging or machining	Pipeline connections in corrosive environments (e.g., marine, chemical plants)‌	Matching corrosion resistance and mechanical strength with base pipes‌
‌Pipe Caps‌	ASTM A403‌, ASME B16.9‌, ASTM A815	Cold forming or machining	Sealing ends of pipelines, pressure vessels	Enhanced sealing performance under cyclic loading‌
‌Flanges‌	ASME B16.5‌/ASME B16.47A/ ASTM A182	Forging, machining	Offshore platform piping, chemical reactor connections	High fatigue resistance, compatibility with duplex piping systems‌

ASTM A789 / ASTM A790 Uns S31803 pipe tube features

PREN value >34
The corrosion resistance of the medium alloy type ASTM A789 / ASTM A790UNS S31803 is between AISI 316L and 6% Mo+N austenitic stainless steel.
Yield strength is about 2 times stronger than 18-8 austenitic stainless steel.

ASTM A789 / A790 Uns S31803 duplex pipe tube applications:

‌Application Field‌	‌Specific Products/Components‌	‌Key Properties Utilized‌
‌Oil & Gas Industry‌	Offshore pipelines, heat exchangers, subsea equipment	High chloride/sulfide corrosion resistance, stress corrosion cracking (SCC) resistance ‌
‌Chemical Processing‌	Pressure vessels, storage tanks, transport pipelines for corrosive chemicals (e.g., acids)	Pitting resistance (PREN >34), mechanical stability in aggressive media ‌
‌Marine Engineering‌	Seawater desalination systems, cooling pipes, shipbuilding components	Resistance to saltwater corrosion, high strength-to-weight ratio ‌
‌Pulp & Paper Industry‌	Bleaching equipment, pulp digesters, chemical storage tanks	Durability in chloride-containing environments, weldability ‌
‌Power Generation‌	Heat exchangers, condensers, geothermal energy systems	Thermal stability, fatigue resistance under high-temperature/pressure cycles ‌
‌Other Applications‌	Food processing equipment, structural components in harsh environments	Hygienic surface, combined strength and ductility ‌

‌ASTM A789 / A790 UNS S31803 Material Advantages:‌

• ‌Dual-phase microstructure‌ (ferrite + austenite) ensures balanced strength (620–1000 MPa tensile) and corrosion resistance‌.
• Complies with ‌ASTM A790/A790M‌ ASTM A789/789M and ‌ASME SA-790‌, ASME SA-789 standards for seamless/welded duplex pipes in industrial use‌.
• Superior weldability and resistance to chloride-induced stress corrosion cracking (SCC)‌

‌ASTM A789/ASTM A790 UNS S31803 Pipe/Tube Customer Success Stories‌

‌Case 1: Offshore Oil & Gas Pipeline Upgrade (Malaysia)‌

‌Client‌: Petronas Carigali
‌Industry Challenge‌:
Subsea pipelines in the South China Sea faced accelerated pitting corrosion (3.2 mm/year) due to high chloride concentrations (28,000 ppm) and H₂S exposure. Existing 316L pipes required bi-annual replacements, costing $1.2M/year in downtime.

‌Engineered Solution‌:

• Supplied ‌S31803 duplex stainless steel tubes‌ (OD 324 mm, WT 12.7 mm) with ‌electropolished inner surfaces‌ (Ra ≤0.4μm, per ASTM B912).
• Implemented ‌argon back-purging‌ during welding to prevent sigma phase formation.
• Delivered ‌NACE MR0175-compliant‌ material for sour service environments.

‌Measurable Outcomes‌:

• ‌Flow Efficiency‌: 15% improvement via reduced turbulence.
• ‌Corrosion Rate‌: Dropped to 0.05 mm/year (ISO 9223 Class C5-M).
• ‌ROI‌: Full cost recovery within 14 months.

‌Client Testimonial‌:
“The duplex tubes eliminated unplanned shutdowns. We’ve standardized this solution across 18 offshore platforms.”

‌Case 2: Chemical Processing Plant Expansion (Germany)‌

‌Client‌: BASF SE
‌Operational Pain Point‌:
316L pipes in a nitric acid distillation unit (65% concentration, 110°C) failed catastrophically within 8 months, causing $850k in production losses.

‌Technical Intervention‌:

• Provided ‌ASTM A790 S31803 seamless pipes‌ (Sch 80S, 219.1 mm OD) with optimized chemistry:
  • ‌Cr/Mo/N Boost‌: 23.2% Cr, 3.2% Mo, 0.18% N (exceeding ASTM A790 minima).
  • ‌Solution Annealing‌: 1040°C water quenching for 50/50 austenite-ferrite phase balance.
• Conducted ‌ASTM G48 Method A‌ testing: CPT = 42°C (vs. 35°C requirement).

‌Performance Metrics‌:

• ‌Service Life‌: Extended from 8 months to 5+ years.
• ‌Maintenance Costs‌: Reduced by 72% annually.
• ‌Safety‌: Eliminated 3 critical HSE incidents/year linked to pipe bursts.

‌Client Feedback‌:
“These pipes handle pH 0.8 environments flawlessly. A textbook example of materials science solving industrial problems.”

‌Technical Specifications Deep Dive‌

‌Material Properties (ASTM A790 UNS S31803)‌

Parameter	Value	Test Standard
‌Chemical Composition‌	Cr: 22.0–23.0%, Mo: 3.0–3.5%, N: 0.14–0.20%	ASTM A923
‌Mechanical Properties‌

• Tensile Strength: ‌795-930 MPa‌
• Yield Strength (0.2% offset): ‌550-620 MPa‌
• Elongation: ‌≥25%‌ (50 mm gauge length)
• Hardness: ‌28–32 HRC‌ (Rockwell C Scale)

‌ASTM A790 UNS S31803 Pipe Corrosion Resistance‌

• ‌Pitting Resistance Equivalent (PRE)‌:‌PRE = %Cr + 3.3×%Mo + 16×%N = 36.2‌
• ‌Critical Crevice Temperature (CCT)‌: 30°C (ASTM G48 Method B)
• ‌Stress Corrosion Cracking‌: Passed 1000h testing in boiling 45% MgCl₂ (ASTM G36)

Astm A790 UNS S31803 Pipe/Tube anufacturing Tolerances‌

Dimension	Tolerance
Outer Diameter (OD)	±1.0% or ±0.5mm (whichever is greater)
Wall Thickness (WT)	+12%/-10%
Straightness	≤1.5mm/m

‌Service Commitments & Value-Added Solutions‌

‌1. ASTM A789/ASTM A790 UNS S31803 Duplex Pipe/Tube Rapid Project Support‌

• ‌24/7 Quote online‌: Connect with certified materials quotation within 6 hours.
• ‌Digital Twin Service‌: Upload your piping layout (PDMS/SP3D) for clash detection and stress analysis.

‌2. ASTM A789/ASTM A790 UNS S31803 Duplex Pipe/Tube Certified Supply Chain‌

• ‌Material Traceability‌: Full EN 10204 3.2 certification with heat-specific PMI reports.
• ‌Third-Party Validation‌: Optional DNV GL/TÜV SÜD mill audits and product certification.

‌3.ASTM A789/ASTM A790 UNS S31803 Pipe/tube Advanced Processing‌

• ‌ASTM A789/ASTM A790 Pipe/Tube Custom Fabrication‌:
  • Orbital TIG welding with 100% X-ray inspection (ASME B31.3).
  • Cold finished seamless with 100% quality compliance Standards of astm a790/ astm a789
  • U-bend tubes with 3D radius (1.5×OD to 5×OD) for heat exchangers.
• ASTM A789/ASTM A790 Pipe/Tube Surface Treatments‌:
  • Electropolishing (Ra ≤0.4μm)
  • Solution Pickling very clean
  • Bead blasting (AA 120-grit finish)

‌4. Global Logistics Network‌

• ‌Stock Availability‌: 5,000 metric tons in stock for clients’ urgent applications.
• ‌Shipping Guarantee‌:
  • EXW,FOB,CFR, CIF delivery to site within 45 days for orders >20 tons.
  • Real-time container tracking via blockchain-enabled platform.

‌Why Partner With Us?‌

✅ ‌Unmatched Expertise‌: 17+ years specializing in duplex stainless steel systems – referenced in NACE SP0108-2023.
✅ ‌Sustainability Leadership‌:

• 100% Quality compliance with clients’ reques (ISO certified ).
• Exllence quality and material grade.
• 12 monthes guaranteed return and exchange.
• Fast delivery and globally reach.
• No MOQ request, clients’ satisfaction is our goal.

‌ASTM A789/ ASTM A790 UNS S31803 Duplex Pipe/Tube FAQ‌

‌Q1: What makes ASTM A790 UNS S31803 duplex pipes superior to 316L/317L for offshore applications?‌

‌A:‌ Our ‌ASTM A790 S31803 duplex pipes‌ provide:

• ‌45% higher yield strength‌ (550 MPa vs. 380 MPa in 316L)
• ‌2.5× better chloride stress corrosion cracking resistance‌ (per NACE TM0177)
• ‌Thinner wall designs‌ possible due to enhanced mechanical properties, reducing material costs by 18-22%.

‌Q2: Do your astm a789/ a790 uns s31803 Duplex pipes/tubes comply with sour service requirements?‌

‌A:‌ Yes. All ‌duplex stainless steel pipes‌ are:

• ‌NACE MR0175/ISO 15156 Compliance for H₂S environments
• Compliance to ‌NACE TM0284 (Hydrogen Induced Cracking)‌ standards
• PMI-verified for standard levels.

‌Q3: Can you customize ASTM A789/ASTM A790 UNS S31803 Duplex pipe/tube dimensions beyond standard ASTM specs?‌

‌A:‌ Absolutely. We specialize in ‌non-standard duplex pipe fabrication‌:

• ‌OD Range‌: 10mm – 2000mm (with ±0.3mm precision)
• ‌Wall Thickness‌: 1.0mm – 80mm (including SCH 5S to SCH XXS)
• ‌Cutting Services‌: Plasma, laser, or abrasive waterjet to ±0.15mm tolerance.

‌Q4: What surface finishes are available for corrosion resistance?‌

‌A:‌ Choose from:

• ‌Electropolished (EP)‌: Ra ≤0.4μm (ideal for ‌high-purity chemical processing‌)
• ‌Pickled & Passivated‌: ASTM A380-compliant oxide layer
• ‌Bead Blasted‌: Uniform 120-220 grit profile for aesthetic applications.

‌Q5: How do you ensure material traceability?‌

‌A:‌ Every pipe includes:

• ‌EN 10204 3.1/3.2 certificates‌ with heat number tracking
• ‌PMI Test Reports‌ (XRF verification of alloy composition)
• ‌Mill Test Reports‌ covering mechanical properties and hydrostatic tests.
• Third Party Inspection is acceptble

‌Q6: What’s your lead time for urgent offshore projects?‌

‌A:‌ We guarantee:

• ‌3-5-day turnaround‌ for standard sizes from our stock
• ‌30-day production‌ for custom orders (vs. industry-average 45 days)
• ‌24/7 logistics coordination‌ with real-time ‌CFR,CIF shipping updates‌.

‌Q7: What if we need technical support after delivery?‌

‌A:‌ Our ‌Lifetime Technical Support‌ covers:

• Free metallurgical consultation within 7 business hours
• Online failure analysis (available in worldwide)
• ‌12-monthes warranty‌ against manufacturing defects.