API 5L X65 QS Seamless Steel Pipe

API X65QS Seamless Steel Pipe is a low-alloy high-strength pipeline steel of API 5L standard PSL2 level, designed for harsh working conditions such as acid, high pressure, and low temperature. Its core feature is "high strength+resistance to hydrogen sulfide corrosion", making it a high-end pipe material choice in the fields of oil and gas, chemical engineering, polar engineering, etc.

1.Core parameters and technical standards execution standards: Strictly follow the API 5L PSL2 pipeline specification, with the QS suffix representing the "quenching+self tempering" process, while meeting the NACE MR0175/ISO 15156 hydrogen sulfide corrosion resistance standard, which can resist corrosion from acidic media such as H ₂ S and CO ₂

2.Specification range: Outer diameter 21.31026mm, wall thickness 2.0120mm, covering the full range of requirements from small-diameter gathering and transmission pipelines to large-diameter mainline pipelines.

Hot-selling Regular Specifications (Domestic Stock & Mass Production)

Outer Diameter (mm)	Wall Thickness (mm)	Application Scenario
114.3 / 168.3	6.0 - 12.0	Oil & gas well gathering branch pipelines
219.1 / 273.0	8.0 - 16.0	Medium-distance transmission pipelines
323.9 / 406.4	10.0 - 20.0	Main pipelines of gas purification stations
508.0 / 610.0	12.0 - 25.0	Long-distance cross-regional trunk pipelines
711.0 / 813.0	16.0 - 30.0	Large-diameter main transmission pipelines

Products Description Technical Data of aPI 5L X65QS

1 Chemical Composition (Heat Analysis, % Max)

Strict low-carbon and ultra-low sulfur design to guarantee anti-hydrogen cracking performance in sour environments:

C	Si	Mn	P	S	V	Nb	Ti	CEIIW
0.16	0.45	1.65	0.020	0.003	0.09	0.05	0.06	≤0.42

2 Mechanical Properties

Item	Standard Value	Unit
Minimum Specified Yield Strength (SMYS)	450 - 600	MPa
Tensile Strength	535 - 760	MPa
Yield Ratio	≤0.93	-
Charpy Impact Energy (-29℃)	≥40	J
Maximum Hardness (HV10)	≤248	HV

3 Mandatory Sour Service Test Indicators

• HIC Test: No crack under NACE TM0284 standard solution A
• SSC Test: Pass NACE TM0177 four-point bending test, no sulfide stress cracking
• Full-body ultrasonic testing, hydrostatic pressure testing 100% qualified

Application

 

1. Petroleum & Natural Gas Industry (Main Application)

• Sour crude oil and natural gas gathering pipelines in sulfur-containing oilfields
• Long-distance trunk pipelines for H₂S and CO₂ mixed gas transmission
• Piping systems inside gas purification stations, oil transfer stations and compressor stations
• Onshore wellhead connecting pipelines and manifold pipelines

2. Chemical Industry

• Transmission pipelines for corrosive chemical medium containing sulfide
• High-pressure process pipelines in petrochemical refineries

3. Offshore & New Energy Projects

• Shallow sea platform acid medium auxiliary pipelines
• Pipeline supporting facilities for geothermal energy transmission projects

4. Municipal & Industrial Pressure Pipeline

• High-pressure industrial circulating pipelines with corrosive water quality
• Key pressure pipeline projects requiring national pressure vessel certification

FAQ

Q1: What is the difference between X65Q and X65QS seamless pipe?

A: Both grades adopt quenched and tempered process. X65Q is for general low-temperature service, while X65QS is upgraded for sour service. X65QS has stricter control on sulfur and phosphorus impurities, and must pass HIC and SSC anti-sulfur corrosion tests. It is forbidden to replace X65QS with X65Q in sulfur-containing oil and gas pipelines.

Q2: Can X65QS pipe be used for non-sour conventional oil and gas pipelines?

A: Yes, but it is not cost-effective. X65QS has higher manufacturing cost due to extra anti-corrosion tests and precise component control. For conventional non-sour pipelines without H₂S, ordinary API 5L X65 PSL2 seamless pipe is more economical.

Q3: What third-party inspection reports can you provide?

A: We can provide original factory mill test certificate (MTC), API 5L certification, HIC/SSC test report, SGS/BV third-party inspection report, hydrostatic test report and ultrasonic flaw detection report to meet project bidding and customs clearance requirements.

Q4: What anti-corrosion coatings are available for X65QS pipes?

A: We support customized surface treatments: black anti-rust paint, transparent anti-rust oil, 2PE/3PE external anti-corrosion coating, FBE epoxy powder anti-corrosion coating. Internal epoxy coating is optional for medium conveying pipelines.

Q5: What is the minimum order quantity?

A: For regular stock specifications, MOQ is 1 ton; for customized non-standard diameter and wall thickness pipes, MOQ is 5 tons. We also support sample order for quality testing before bulk order.

Q6: What is the suitable working temperature range for X65QS pipes?

A: Long-term stable working temperature: -40℃ ~ 80℃. It maintains excellent impact toughness and anti-cracking performance in low-temperature and high-pressure sour environments, suitable for most onshore oilfield projects in cold regions.

Q7: Is X65QS seamless pipe same as L450QS?

A: Completely identical. X65 is the US customary grade mark under API 5L standard, while L450QS is the metric grade mark. They have consistent chemical composition, mechanical properties and test standards, and can be used interchangeably in engineering design.

How To Cooperate With Us?

Our address

Rm1406,14th/F No 208, Hongqi Road, Nankai Dist, Tianjin City ,China

Phone Number ( WhatsApp/Wechat)

+86 16622033809

E-mail

alisa@tjshenzhoutong.com

Hot Tags: api 5l x65 qs seamless steel pipe, China api 5l x65 qs seamless steel pipe manufacturers, suppliers, factory, seamless pile pipe, seamless pipe for drainage, seamless pipe for gate connection, seamless pipe for limiter connection, seamless pipe for recovery system connection, seamless pipe for reducer connection