How much do you know about seamless carbon steel tubes

- Jan 24, 2019-

Seamless steel tubes are rolled from solid billet through perforation.

Cold rolled (dialed) seamless steel tubes embrace general steel tubes, low and medium pressure boiler steel tubes, air mass boiler steel tubes, steel tubes, chrome steel tubes, oil cracking tubes, and different steel tubes, still as carbon thin-walled steel tubes, alloy thin-walled steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, chrome steel tubes, and chrome steel tubes.The external diameter of hot-rolled seamless steel tube is mostly bigger than 32mm, and also the wall thickness is two.5-75mm. The diameter of cold-rolled seamless steel tube may be up to 6mm, the wall thickness may be up to zero.25mm, the external diameter of thin-walled tube may be up to 5mm, and also the wall thickness is a smaller amount than zero.25mm. The cold rolling has higher dimensional accuracy than the new rolling.

Generally used seamless steel tube: it's made from ten, 20, 30, 35, forty five and different high-quality carbon-bonded steel 16Mn, 5MnV and different low-alloy steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and different steel hot rolled or cold rolled.Seamless steel tubes made from low steel like ten and twenty are principally employed in fluid conveyance pipelines.Seamless steel tubes made from medium steel like 40Cr are accustomed create mechanical components, like the stressed components of cars and tractors.In general, the employment of seamless steel tube to make sure the strength and flattening check.Hot rolled steel pipe delivered in hot rolled or heat treated condition;Cold rolling is delivered in heat-treated condition.

Seamless steel tube for low and medium pressure boilers: used for producing varied low and medium pressure boilers, superheated steam pipes, boiling water pipes, water wall pipes, superheated steam pipes for locomotive boilers, giant smoke pipes, little smoke pipes and arch brick pipes, etc.Use top quality carbon steel hot rolled or cold rolled (dialed) seamless steel tube.It is principally made from no. 10 and no. 20 steel. additionally to chemical composition and mechanical properties, water pressure check, flanging, flaring and flattening tests are needed.Hot rolling shall be delivered in hot rolling condition, and cold rolling (rolling) shall be delivered in heat treatment condition.

High-pressure boiler tubes: principally employed in the manufacture of air mass and over pressure boiler pipes, etc. With top quality carbon steel, steel and untainted heat resistant steel seamless steel tube, these typically beneath extreme temperature and air mass boiler tube, tube in extreme temperature flue gas and steam can happen beneath the action of oxidisation and corrosion, that the steel pipe with high rupture strength, high oxidisation resistance, and have sensible structure stability, victimisation steel grade are: top quality carbon steel grade twenty g, 20 MNG, twenty five MNG;The steel Numbers of alloy steel are 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.In addition to making sure the chemical composition and mechanical properties, the hard-hitting boiler tubes of 1Cr18Ni9 and 1Cr18Ni11Nb are unremarkably employed in rust-resistant steels for water pressure tests, flaming and flattening tests.Steel tubes are delivered in heat-treated condition.In addition, the finished steel tube microstructure, grain size, decarburization layer conjointly has bound needs.

Seamless steel tube for earth science drilling and oil drilling: to explore the structure of underground rock strata, groundwater, oil, fossil fuel and natural resources, the employment of drilling RIGS drilling.Drilling is indispensable for oil and fossil fuel exploitation. Seamless steel pipe used for oil drilling for earth science drilling is that the main drilling instrumentality, principally as well as outer core pipe, inner core pipe, casing pipe, drill pipe, etc.Due to the pipe to travel deep into the thousands of meters formation depth work, operating conditions is incredibly complicated, drill pipe beneath pull, pressure, bending, torsion and uneven impact load stress, however conjointly by mud, rocks and wear, therefore, needs tube should have adequate strength, hardness, wear resistance and impact toughness, steel pipe steel with "DZ" pinyin "(geology) and most wanted on behalf of the steel yield purpose, aforesaid common steel grade DZ45 MNB forty five, fifty mn;DZ50 40Mn2, 40Mn2Si;DZ55's 40Mn2Mo, 40MnVB;DZ60's 40MnMoB and DZ65's 27MnMoVB.All steel tubes are delivered in heat-treated condition.

Petroleum cracking pipe: seamless steel pipe for furnaces, heat exchangers and pipelines in oil refineries.Commonly used top quality steel (10, 20), steel (12CrMo, 15CrMo), heat resistant steel (12Cr2Mo, 15Cr5Mo), chrome steel (1Cr18Ni9, 1Cr18Ni9Ti) producing.In addition to the chemical composition and varied mechanical properties of the steel pipe, however conjointly to make sure that water pressure, flattening, like flaring check, and surface quality and non-destructive scrutiny.Steel tubes to be delivered in heat treated condition.Stainless steel pipe: with all types of chrome steel hot rolled, cold rolled chrome steel pipe, wide employed in oil, chemical instrumentality pipelines and varied USES of chrome steel structure components, additionally to the chemical composition and mechanical properties ought to be secured, wherever used as a sway fluid pressure steel pipe to make sure that the water pressure check qualified.All kinds of special steel pipes shall be secured consistent with the required conditions.

Cangzhou Steel Pipe Group (CSPG) Co., Ltd

Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.

Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects

Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555


Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners


Cold drawn seamless steel pipe process

round tube → heating → perforation → Heading → annealing → pickling → oiled (copper) → multi-pass cold drawn (cold rolled) → blank tube → heat treatment → straightening →hydrostatic testing (testing) → mark → storage.Cold drawn seamless steel tube process - How to make seamless steel pipe

The general cold strip mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the mechanical properties of the corresponding standard specifies. Cold rolled steel surface quality, appearance, dimensional accuracy better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.

Cold rolled steel coil substrate products deep processing of high value-added products. Such as electro-galvanized, hot dip galvanized, electro-galvanized fingerprint resistant, painted steel roll damping composite steel, PVC laminating steel plates, etc., so that the excellent quality of these products has a beautiful, high resistance to corrosion, has been widely used.

Cold rolled steel coil finishing after annealing, cut the head, tail, trimming, flattening, smooth, heavy volume, or longitudinal clipboard. Cold-rolled products are widely used in automobile manufacturing, household electrical appliances, instruments, switches, buildings, office furniture and other industries. Steel plate strapping package weight of 3 to 5 tons. Flat sub-volume typically 3 to 10 tons / volume. Coil diameter 6m.

Cold drawn steel tube is with hot-rolled steel coil as raw material, and tandem cold rolling pickled to remove oxide scale, its finished rolling hard roll, rolling hard volumes due to the continuous cold deformation caused by cold hardening strength, hardness increased indicators declined tough plastic, stamping performance will deteriorate, which can only be used for simple deformation of the parts.


Hot-rolled seamless steel pipe production base deformation process can be summarized as three stages: perforation, extension and finishing.

round tube → heating → perforation → → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening hydraulic test (orflaw) → tag → storage.

Billet is fed into the heating furnace, the temperature is about 1200 degrees Celsius. Fuel for a hydrogen or acetylene. The furnace temperature control is critical to wear air tube round, after the release of pressure puncher. which are generally more common puncher tapered roller punch this punch, high production efficiency, product quality, perforated expanding volume, wearing a variety of steels. After perforation, round tube has been three-roll cross rolling, rolling or extrusion.

After extrusion off pipe sizing. Sizing mill by the high-speed rotation of the cone drill into the Billet punch to form a steel pipe. The steel pipe inner diameter is determined by the length of the outer diameter of the sizing mill drill. After sizing, the steel pipe to enter the cooling tower by the water spray cooling, the steel pipe after cooling, it is necessary to be straightening. Sent by conveyor pipe by straightening the metal detection machine (or hydrostatic test) to conduct an internal flaw. Steel pipe internal issues such as cracks, bubbles will be detected.

Steel pipe quality inspection but also through a rigorous manual selection. Steel pipe of Quality Supervision, Inspection, use spray paint on the number, size, production batch. By a cable car hanging into the warehouse.

Hot rolled seamless steel pipe deformed processes - How to make seamless steel pipe


There are probably hundreds of different methods for packing a steel pipe, and most of them have merit, but there are two principles that are vital for any method to work prevent rusting and Sea transportation security.

We can makes and markets cold-drawn and hot rolled seamless steel pipes and cold-drawn special-section seamless pipes which are widely applied in the industries of petrochemical, boiler, automobile, mechanical, construction.


Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.

Product nameExecutive standardDimension (mm)Steel code/ Steel grade
CastingAPI 5CT114~219 x 5.2~22.2J55, K55, N80, L80, P110
TubingAPI 5CT48.3~114.3 x 3.2~16J55, K55, N80, L80, H40
CastingAPI 5L10.3~1200 x1.0~120A, B, X42, X46, X52, PSL1 / PSL2

American Society for Testing and Materials(ASTM), American Society of Mechanical Engineers (ASME)

Product nameExecutive standardDimension (mm)Steel code/ Steel grade
Black and Hot-dipped Zinc-coated Steel Pipes SeamlessASTM A530.3~1200 x 1.0~150GR.A, GR.B, GR.C
Seamless Carbon Steel for High Temperature ServiceASTM A10610.3~1200 x 1.0~150GR.B, GR.C
Seamless Cold-drawn Low-Carbon Steel Heat-Exchanger and Condenser TubesASTM A17910.3~426 x 1.0~36Low Carbon Steel
Seamless Carbon Steel Boiler Tubes for High PressureASTM A19210.3~426 x 1.0~36Low Carbon Steel
Seamless Cold-drawn Intermediate Alloy Steel Heat-exchanger and Condenser TubesASTM A19910.3~426 x 1.0~36T5, T22
Seamless Medium-carbon Steel Boiler and Superheater TubesASTM A21010.3~426 x 1.0~36A1, C
Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-exchanger TubesASTM A21310.3~426 x 1.0~36T5, T9, T11, T12, T22, T91
Seamless Carbon and Alloy Steel for Mechanical TubingASTM A3331/4″~42″ x SCH20~XXSGr1, Gr3, Gr6
Seamless Cold-drawn Carbon Steel Feedwater Heater TubesASTM A55610.3~426 x 1.0~36A2, B2

Germany Safety(GS), Deutsches Institut für Normung(DIN)

Product nameExecutive standardDimension (mm)Steel code/ Steel grade
Seamless Steel Tubes for Elevated TemperatureDIN 1717510~762 x 1.0~120St35.8,St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36
Manufacturing pipeline,vessel,equipment,pipe fittings.DIN 162913.5~762 x 1.8~120St37.0, St44.0, St52.0
Seamless steel tubes for pressure purposesEN 102164.0~60.0 x 0.5~8
5-7 m manufacturing lenght
P235GH TC1, P235GH TC2, 16Mo3
Seamless precision steel tube applicationsEN 10305-113.5~165.1 x 1.8~4.85St33.2
Seamless Precision Steel TubeDIN 23914.0~60.0 x 0.5~8St35, St45, St52
Seamless Steel TubesDIN 244013.5~165.1 x 1.8~4.85St33.2

Japanese Industrial Standards (JIS) specifies the standards used for industrial activities in Japan.

Product nameExecutive standardDimension (mm)Steel code/ Steel grade
High pressure and high temperature serviceJIS G3454/5/619.05~114.3 x 2.0~14JIS G3454(STPG370, STPG410), JIS G3455(STS370, STS410, STS480), JIS G3456(STPT370, STPT410, STPT480)
Tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.JIS G344519.05~114.3 x 2.0~14STKM11A, STKM12(A,B,C), STKM13(A,B,C), STKM14(A,B,C).
Carbon steel/Alloy steel boiler and heat exchanger tubesJIS G3461,219.05~114.3 x 2.0~14G3461(STB340, STB410, STB510)
G3462(STBA22, STBA23)
Seamless steel tubes for high pressure gas cylinderJIS G342919.05~114.3 x 2.0~14
Length: max 16000mm
STH11, STH12, STH21, STH22
Product nameExecutive standardDimension (mm)Steel code/ Steel grade
Low and medium pressure boiler seamless pipeGB 308719.05~114.3 x 2.0~1410#, 20#, 20G
Low-temperature heat exchanger tubes seamless steel pipeGB/T1898419.05~351 x 2.0~1406Ni3MoDG, 09DG, 09Mn2VDG, 10MnDG, 16MnDG
High pressure and above pressure steam boiler tubes with high quality carbon structural.GB531019.05~114.3 x 2.0~1420G, 20MnG, 25MnG, 15MoG, 20MoG, 12CrMoG, 15CrMoG(T12/P12), 12CrMoG, 12Cr2MoWVTiB.