This standard applies to seamless steel pipe used in high-temperature environments, steel pipe material is heat-resistant steel, can maintain good mechanical properties and corrosion resistance at high temperatures. Steel pipe is manufactured by hot rolling or cold drawing process. Heat treatment such as normalizing, annealing or quenching and tempering is required to ensure its high temperature performance.

Product Size

Outer diameter: 21.3～610mm
Wall thickness: 2.77～70.00mm
End: Flat end, beveled or threaded for selection
Length: 3 to 12 meters or SRL, DRL, double-footed and fixed-footed

Product Packaging

Exterior surfaces varnished clear/black, hot-dipped galvanized or corrosion-resistant (FBE, 3LP, 3LPP) optional, steel strapping.

Chemical composition

Steel Type		Chemical composition % (wt)									Colors①
Abbreviations	Material No.	C	Si	Mn	P	S	Cr	Mo	Ni	V	Colors①
St35.8	1.0305	≤0.17	0.1-0.35②	0.40-1.30	0.040	0.040					White
St45.8	1.0405	≤0.21	0.1-0.35②	0.40-1.20	0.040	0.040					Yellow
17Mn4③	1.0481③	0.14-0.20	0.20-0.40	0.90-1.20	0.040	0.040	≤0.30				Red and Black
19Mn5③	1.0482③	0.17-0.22④	0.30-0.60	1.00-1.30	0.040	0.040	≤0.30
15Mo③	1.5415	0.12-0.20④	0.10-0.35	0.40-0.80	0.035	0.035		0.25-0.35
13CrMo44	1.7335	0.10-0.18④	0.10-0.35	0.40-0.70	0.035	0.035	0.70-1.10	0.45-0.65
10CrMo910	1.7380	0.08-0.15	≤0.50	0.40-0.70	0.035	0.035	2.00-2.50	0.90-1.20
14MoV63	1.7715	0.10-0.18	0.10-0.35	0.40-0.70	0.035	0.035	0.30-0.50	0.50-0.70		0.22-0.32
X20CrMoV121	1.4922	0.17-0.23	≤0.50	≤1.0	0.030	0.030	10.00-12.50	0.80-1.20	0.30-0.80	0.25-0.35
① Generally, the tube is marked at both ends with the indicated ring color markings. The indicated color markings may also be applied to the entire length of the tube upon request and as agreed upon at the time of order. ② If the steel is sedated with aluminum or deoxidized in a vacuum, a silicon content of less than the lower limit of 0.10% is permitted. ③ This steel may only be considered as tubes for containers. ④ The carbon content is allowed to increase by 0.02% when the tube wall is ≥ 30 mm.

Product Mechanical Properties

If the wall thickness exceeds 65 mm, the value must be agreed upon at the time of ordering.

Steel Type		Tensile strength N/mm²	Yield strength ①, ② Wall thickness, mm			延伸率(L-5do)		Notched Impact Work (DVM I specimen)
Abbreviations	Material No.		≤16	＞6≤40	＞40≤60	vertically	vertical	vertical
Abbreviations	Material No.		N/mm²minimum value			% minimum value		∂ minimum value
St35.8	1.0305	350-480	235	225	215	25	23	34
St45.8	1.0405	410-530	255	245	235	21	19	27
17Mn4	1.0481	460-580	270	270	260	23	21	34
19Mn5	1.0482	510-610	310	310	300	19	17	34
15Mo3	1.5415	450-600	270④	270	260	22	20	34
13CrMo44	1.7335	440-590	290④	290	280	22	20	34
10CrMo910	1.7380	450-600	280	280	270	20	18	34
14MoV63	1.7715	460-610	490	320	310	20	18	41
X20CrMoV121	1.4922	690-540	235	490	490	17	14	34④
① wall thickness ≤ 3mm, outside diameter ≤ 30mm tube, the minimum value can be reduced by 10N/m ㎡ ②) If the wall thickness > 60mm, for St35.8, St45.8, 17Mn4, 19Mn5, 15M03 and 14MoV63 steel grade made of pipe values can be agreed upon;. If the wall thickness of > 60 to ≤ 80mm on the 13CrMo44 steel pipe minimum value of 270N/m ㎡ and 10CrMo910 steel for 260N/m ㎡, the minimum value of X20CrMoV121 steel pipe can be 490 N/m ㎡. ③ For longitudinal specimen test (see Section 8.5.3), the minimum value of notched impact work can be increased by 14J. ④ For wall thickness ≤10 mm, the minimum value shall be increased to 15 N/m㎡. ⑤) The minimum value can be reduced to 27J for hot rolled steel tubes.

Application
Mainly used for: boilers, superheaters, heat exchangers, other high temperature equipment.

Production And Processes

We have two pipe product manufacturing bases in Yantai, Shandong Province. One of them, the General Pipe Manufacturing Base, has a history of nearly 70 years and is equipped with five hot-rolling production lines and one cold-drawing production line, with an annual production capacity of up to 500.000 tons. Leveraging our mature production processes and economies of scale, our product range encompasses over 1.000 specifications of pipe products, fully compliant with international standards such as API 5L, ASTM A106. and ASTM A333. While ensuring quality, we also offer a leading price advantage.

Our high-standard pipeline product production base has a stable production capacity of 800.000 tons, primarily producing high-grade steel products such as API 5L X100 PSL2. API 5CT Super 13Cr, and ASTM A335 P91. Our product specifications cover a wide range, with a maximum outer diameter of 20 inches, a wall thickness of up to 70 millimeters, and a single-piece length of up to 36 meters, capable of meeting the demands of steel pipes in various harsh operating conditions.

Inventory And Quality Inspection

We operate under the YANTAIPIPE brand and have established solid partnerships with a number of outstanding manufacturers of steel pipes, pipe fittings, flanges, and valves. We operate three large warehouses and processing plants in Yantai and Cangzhou ensuring a minimum inventory capacity of over 35.000 tons. We not only provide products but also offer comprehensive services such as project packaging, corrosion-resistant coatings, advanced processing, and customized solutions. Through our mature supply chain system and resource integration capabilities, we create added value for our customers from all angles, enabling us to maintain a core competitive advantage in the international market!

Customer Feedback

Qualification

Special equipment type test certificate (pressure pipeline components)

Customer visit

Shipping Packaging

International Cooperation

Our products have been widely used in major energy projects around the world. We provide services to international energy giants, including China National Petroleum Corporation, Sinopec, Shell, Total, as well as national oil companies from Kuwait, Azerbaijan, Abu Dhabi, Qatar, Algeria, and Saudi Arabia. This has allowed us to accumulate extensive experience in serving international projects.

Main Projects

We are deeply involved in major global energy projects, including the Clean Fuel Project of Kuwait National Petroleum Company (KNPC), the North Field East (NFE) LNG Project in Qatar, the multiphase flow processing station project in Hassi Messaoud, Algeria, and the modernization project of SOCAR Haor for the State Oil Company of Azerbaijan (SOCAR). We provide our clients with comprehensive solutions that cover procurement, processing, quality inspection, delivery, and after-sales service.

KNPC Clean Frue Project

Onshore LNG Facilities Of The North Field East Project

Hassi Messaoud MPS Project

SOCAR Haor Modernization Project - Package A

HDO HPC Project AG

The Natural Gas Pipeline Project of Petronas

Saudi Arabia's Jazan Integrated Gasification Combined Cycle (IGCC) Power Generation Project

Mubadala Energy Thailand Sarakhan MN112 Project

GE 9E Gas Turbine Pipeline Prefabrication Project.

FAQs

Do you require a minimum order quantity(MOQ)?

We have no minimum order quantity requirements. Even if you only need one steel pipe or one pipe fitting, we can deliver on time and provide comprehensive services. Please note that certain high-grade steel products may require temporary production scheduling, which may result in minimum order quantity requirements. For specific details, please consult our sales team.

Do you offer product samples?

Of course, we provide free samples for products priced below $1,000. You only need to cover the shipping costs. For products priced above $1,000, please contact our sales team to discuss specific fees.

How long is your shipping cycle?

For products that are in stock, we will complete the final processing, quality inspection, packaging, and other steps within two weeks and deliver them as soon as possible according to the shipping schedule. For products that need to be ordered for production, an additional 2-3 weeks of production time will be required depending on the quantity requested.

Do you offer additional quality assurance?

In addition to providing factory warranty certificates, we can also provide test reports from internationally recognized quality testing agencies such as SGS, TUV, and DNV upon customer request. We are also available to assist third-party testing agencies with process inspections and final inspections prior to shipment.

Is it possible to visit your factory?

Of course! Whether it's our own factory, processing plant, or our partners' factories, we welcome you to visit and exchange ideas at any time. If you need our assistance with visa matters, please feel free to contact our sales manager.

Are you a supplier or a manufacturer?

We are both a supplier and a manufacturer. We have three processing plants and warehouses, as well as a seamless steel pipe factory. We also collaborate closely with other outstanding steel pipe and pipe fitting factories in China, enabling us to offer a wide range of product specifications and a complete product system.