Seamless pipes by Standard

Seamless pipes by standards include: ASTM, JIS, DIN, GB and customers for international

astm seamless pipe

Sunny Steel are professional in

ASTM Seamless pipe

Our ASTM Specification pipe and tube are locally sourced…

din en steel pipes

DIN/EN Steel pipes

DIN Standards are the results of work at national, European and/or international level.

gb steel pipes

GB steel pipes

GB steel pipe has an important position in China’s steel pipe industry.

jis seamless pipe

JIS seamless pipes

are steel pipe that have been created by JIS and meets certain performance requirements.

tubing casing

Tubing & casing

Tubing and casing pipe are essential tools for oil exploration

Available Specification standard

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.


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, T5b, T9 , T11, T22 ,T91
Seamless Carbon and Alloy Steel for Mechanical TubingASTM A3331/4"-42" x SCH20-XXSGrade1 Gr. 3,Gr..6, Gr.8 , Gr. 9
Seamless Cold-drawn Carbon Steel Feedwater Heater TubesASTM A55610.3-426 x 1.0-36A2, B2
Round and shaped steel cold formed welded and seamless carbon steel structural pipe.ASTM A500OD :10.3-820 x 0.8- 75Grade A, B, C, D
Carbon and alloy steel mechanical tubing, either hot-finished or cold-finishedASTM A51910.3-426 x 1.0-361020, 1025, 4130, 4140
For seamless ferritic alloy-steel pipe for high-temperature serviceASTM A3351/4"-42" x SCH20-XXSA/SA 335 P1, P2, P11, P12, P15, P22, P91, P92, P122

DIN/EN - European Standards for steel

DIN- Das Deutsche Institut für Normung e.V. (DIN) ist die unabhängige Plattform für Normung und Standardisierung in Deutschland und weltweit.
EN-The purpose of European standards .
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

JIS- Japanese Industrial Standards

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

G – Ferrous Materials and Metallurgy
H – Nonferrous Materials and Metallurgy
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)
Seamless steel tubes for high pressure gas cylinderJIS G342919.05-114.3 x 2.0-14
Length: max 16000mm
G3462(STBA22, STBA23)STH11, STH12, STH21, STH22


Guobiao standards or GB standards are the Chinese national standards issued by the Standardization Administration of China, the Chinese National Committee of the ISO and IEC. GB stands for Guobiao, Chinese for national standard. Mandatory standards are prefixed "GB".
Product nameExecutive standardDimension (mm)Steel code/ Steel grade
Used for manufacturing various low and medium pressure boilers.GB 308719.05-114.3 x 2.0-1410#, 20#
Low-temperature heat exchanger tubes seamless steel pipeGB/T1898419.05-351 x 2.0-1406Ni3MoDG, 09DG, 09Mn2VDG, 10MnDG, 16MnDG
GB 8163 steel pipe is a seamless steel pipe for fluid transportation (GB/T8163-2018)GB/T 816319.05-351 x 2.0-1410#
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.

Steel Pipe & Tubing – All you need to know

Condition on delivery of steel pipe

Cold-finished/hard (cold-finished as-drawn)BKNo heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked)BKWAfter the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
AnnealedGBKAfter the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
NormalizedNBKThe tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.
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.

Dimension tolerances of seamless steel pipe

Pipe typesPipe Szie(mm)Tolerances
Hot rolledOD<50±0.50mm
≥4-20+15%, -12.5%
Cold drawnOD6-10±0.20mm
>1-3+ 15%, – 10%
>3+ 12.5%, – 10%

Hot-rolled seamless pipe

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

Cold drawn seamless tube

Cold drawn seamless tube and pipe is produced by piercing hot billets and subsequent rolling which reduces their diameter and elongates them.

Boiler Tubes

Boiler tubes are used in heat exchange appliances in which the energy is transferred from one medium to the other.

Recommended seamless pipes

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.