Name: China ASTM A335 P92 Alloy Seamless Steel Tube Pipe Manufacturers Suppliers Factory - Shenzhoutong Steel Pipe
Brand: Shenzhoutong
SKU: 305417636

ASTM A335 / ASME SA335 P92 is premium seamless ferritic Cr-Mo-V-Nb alloy steel pipe for ultra-high temperature & high pressure service.

Compared with P91, P92 adds Tungsten & Boron to dramatically boost creep rupture strength, long-term microstructure stability and high-temperature oxidation resistance, working safely under 600–650°C ultra-supercritical operating conditions. All pipes are fully seamless hot-rolled/cold-drawn, free of welding defects, with full non-destructive testing (UT, ET, Hydrostatic Test) and official Mill Test Certificate EN 10204 3.1 for global power & petrochemical projects.

Complete Technical Parameters:

1. Chemical Composition (Weight %, ASTM A335 Standard)

Element	Min (%)	Max (%)	Function Description
C	0.07	0.13	Improve basic tensile & hardening performance
Si	-	0.50	Anti-oxidation at high temperature
Mn	0.30	0.60	Refine grain, enhance ductility
P	-	0.020	Impurity limit, avoid brittleness
S	-	0.010	Impurity limit, prevent hot cracking
Cr	8.50	9.50	Anti-corrosion & high-temperature oxidation resistance
Mo	0.30	0.60	Promote creep resistance, stabilize carbide
V	0.15	0.25	Precipitation strengthening, improve toughness
W	1.50	2.00	Core element to upgrade high-temperature creep performance vs P91
N	0.03	0.07	Strengthen matrix, stabilize microstructure
Nb	0.04	0.09	Fine MX precipitate, extend service life
B	0.001	0.006	Boost long-term rupture strength

2. Mechanical Properties (Room Temperature, Min. Value)

Test Item	Standard Requirement
Tensile Strength (Rm)	≥620 MPa
Yield Strength (Rp0.2)	≥440 MPa
Elongation (A)	≥20%
Hardness (HB)	≤250 HB

3 .Production & Dimension Specifications

Manufacturing Process: EAF Smelting → LF+VD Vacuum Refining → Billet Piercing → Hot Rolling / Cold Drawing → Normalizing + Tempering Heat Treatment → Straightening → Finishing

Size Scope

Outer Diameter: 16mm ~ 1422mm

Wall Thickness: 2mm ~ 140mm

Standard Length: Single Random 5–7m, Double Random 10–12m, Custom Cut Length

Pipe End: Plain End / Beveled End for Welding

Surface Finish: Black hot-rolled finish / Light anti-rust oil / Varnish coating

Tolerance Compliance: Strict ASTM A335 dimensional tolerance for OD, WT, straightness

NDE Inspection: 100% Ultrasonic Test, Eddy Current Test, Hydrostatic Pressure Test

Qualified Chinese P92 Pipe Manufacturers & Suppliers

All below factories hold ISO, CE, ASME boiler pressure vessel certification, mass stable output of A335 P92 seamless alloy pipe for global export:

Tianjin Pipe Group (TPCO / Tianjin Seamless)

China top state-owned seamless steel pipe mill, full OD range P92 hot-rolled thick-wall pipe, primary supplier for domestic & overseas ultra-supercritical power plants, strict PMI material inspection.

Yangzhou Chengde Steel Pipe Co., Ltd.

Large-diameter heavy wall alloy pipe specialist (OD 219–1422mm), large annual export volume to Southeast Asia, Middle East power station projects.

Baowu Steel Group (Shanghai Baosteel / Inner Mongolia Baosteel)

Premium high-alloy tube production line, stable high-purity P92 billet raw material, supply for high-end AUSC power unit main steam pipeline.

Yuhong Group (Ningbo)

Integrated alloy pipe production & export enterprise, small & medium size cold-drawn P92 tube stock, flexible MOQ for engineering distributors.

Cangzhou Baoyang / Hebei Hongcheng Pipeline Industry

Large spot warehouse of P92 seamless pipe, full-size inventory, fast delivery for project urgent orders, cooperate with above major steel mills as authorized distributor.

Application Fields

1.Thermal Power Generation (Core Application)

Ultra-supercritical (USC) & Advanced Ultra-supercritical (AUSC) boiler four major pipelines
Main steam pipeline, reheat steam pipeline, superheater & reheater header tubes
High-temperature high-pressure boiler superheater coils, furnace wall tubes
Combined cycle gas turbine high-temperature fluid pipelines

2. Petrochemical & Refinery Industry

High-temperature reactor heating coils, hydrogenation unit process pipelines
Crude oil refining high-pressure heat exchanger tubes
Coal chemical synthetic gas high-temperature transmission piping

3 .Other Heavy Industry

Waste-to-energy boiler high-temperature pressure components
Solar thermal power heat collection pipelines
Heavy industry high-temperature pressure vessel connecting pipes

FAQ

Q1: What is the maximum continuous service temperature of A335 P92 pipe?
A1: Long-term stable working temperature up to 620°C, short-term peak temperature 650°C; far better creep performance than P91 for 600°C-class ultra-supercritical power stations.
Q2: Is P92 weldable? What welding requirement should we follow?
A2: Yes, good weldability. Pre-heat ≥200°C before welding; mandatory Post-Weld Heat Treatment (PWHT) at 750–780°C after welding to avoid martensite hardening & cracking. Matched welding consumable: P92 alloy welding rod/wire.
Q3: Can China manufacturers supply full MTC & third-party inspection?
A3: All our cooperative mills issue EN 10204 3.1 Mill Test Certificate with full chemical & mechanical test data. We support third-party inspection before shipment: SGS, BV, TUV, as buyer's request.
Q4: What's the MOQ & delivery time?
A4: Spot inventory MOQ: 3 tons for common sizes; Custom hot-rolled production MOQ: 10 tons. Spot goods delivery within 7–15 days; Custom production lead time 30–45 days.
Q5: What price terms can we accept?
A5: FOB Tianjin / Shanghai Port, CFR / CIF destination port, EXW factory price all available. We offer competitive factory-direct price without middleman markup.
Q6: How to distinguish P92 from P91 on site?
A6: 1. Check pipe spray mark heat number & MTC chemical composition (P92 contains W 1.5–2.0%, P91 has zero tungsten); 2. On-site PMI portable material inspection for rapid alloy element identification.
Q7: Can we customize cutting length & pipe end bevel angle?
A7: Fully support custom fixed cut length, customized bevel angle 30°/37.5°/45°, pipe end chamfer, anti-rust coating, logo printing per buyer's project requirement.
Q8: Is P92 pipe suitable for sulfur-containing high-temperature fluid?
A8: Its 8.5–9.5% Cr content provides moderate anti-oxidation & sulfur corrosion resistance; for severe high-sulfur medium, we recommend further anti-corrosion lining solution.