Seamless steel pipes

We can makes and markets cold-drawn and hot rolled seamless steel pipes without a seam or a weld-joint.

ASTM A179 / A179M - 90a

Description	Features Specifications	Chemical Composition	SA-450/SA-450M

ASTM A179 Tubes shall be made by the seamless process and shall be cold drawn. Heat and product analysis shall be performed wherein steel materials shall conform to required chemical compositions of carbon, manganese, phosphorus, and sulfur. The steel materials shall also undergo hardness test, flattening test, flaring test, flange test, and hydrostatic test.

We can easily offer different grades of cold drawn seamless steel tubes, such as A179.

ASTM A179 (ASME SA179) cold drawn steel tube

STEEL A179 BOILER PIPE DIN 2458

ASTM A179 Cold Drawn Carbon Steel Pipe

Cold Drawn Seamless Carbon Steel Tube ASTM A179

Cold Drawn Tube ASTM A179

Because of ASTM A179 grade’s temperature withstanding capabilities, it is applied to steel pipe of tubular heat exchanger, condensers and similar heat transfer equipment. Our ASTM A179 seamless tubes are used in sugar mills & distilleries, pumps and petrochemicals, cement and construction industries and steel plants. Sunny Steel can supply ASTM A179 steel tube from stock or from reputed steel mills. We also offer steel fabrication service where steel plates can go through processings like cutting, welding, bending, machining, pre-coating, pre-lined, beveling, or as you require.

This specification covers minimum-wall thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus. Tubes shall be made by the seamless process and shall be cold drawn. Heat and product analysis shall be performed wherein steel materials shall conform to required chemical compositions of carbon, manganese, phosphorus, and sulfur. The steel materials shall also undergo hardness test, flattening test, flaring test, flange test, and hydrostatic test.

Note:

Mill test certificates will be issued according to EN10204.3
All tubes shall be supplied as per applicable ASTM Specification.
The tubes Shall be Seamless and the testing shall be as per A 450 / A450M.

Features Specifications

OD(mm)	Wall Thickness Unit(mm)
OD(mm)	2	2.5	3	3.5	4	4.5	5	6	6.5-7	7.5-8	8.5-9	9.5-10	11	12
Φ25-Φ28	●	●	●	●	●	●
Φ32		●	●	●	●	●	●
Φ34-Φ36		●	●	●	●	●	●
Φ38		●	●	●	●	●	●
Φ40			●	●	●	●	●
Φ42			●	●	●	●	●
Φ45			●	●	●	●	●	●
Φ48-Φ60			●	●	●	●	●	●	●
Φ63.5				●	●	●	●	●	●	●
Φ68-Φ73					●	●	●	●	●	●
Φ76					●	●	●	●	●	●	●	●	●	●
Φ80					●	●	●	●	●	●	●	●	●	●
Φ83					●	●	●	●	●	●	●	●	●	●
Φ89					●	●	●	●	●	●	●	●	●	●
Φ95					●	●	●	●	●	●	●	●	●	●
Φ102					●	●	●	●	●	●	●	●	●	●
Φ108					●	●	●	●	●	●	●	●	●	●
Φ114						●	●	●	●	●	●	●	●	●
Φ121						●	●	●	●	●	●	●	●	●
Φ127						●	●	●	●	●	●	●	●	●
Φ133						●	●	●	●	●	●	●	●	●
Φ140							●	●	●	●	●	●	●	●
Φ146							●	●	●	●	●	●	●	●
Φ152							●	●	●	●	●	●	●	●
Φ159							●	●	●	●	●	●	●	●
Φ168							●	●	●	●	●	●	●	●

Grade and Chemical Composition (%)

Chemical Composition	C	Mn	P≤	S≤	Si≤
Chemical Composition	0.06-0.18	0.27-0.63	0.035	0.035	0.25

Mechanical properties

Yield Strength (Mpa)	Tensile Strength (Mpa)	Elongation (%)
≥180	≥325	≥35

SA-450/SA-450M

OD In (mm)	+	-	WT In(mm)	+	-
<1(25.4)	0.10	0.10	≤1.1/2(38.1)	20%	0
11.1/2(25.438.1)	0.15	0.15	>1.1/2(38.1)	22%	0
>1.1/2<2(38.150.8)	0.20	0.20
2<2.1/2(50.863.5)	0.25	0.25
2.1/2<3(63.576.2)	0.30	0.30
34(76.2101.6)	0.38	0.38
>47.1/2(101.6190.5)	0.38	0.64
>7.1/29(190.5228.6)	0.38	1.14

Material Comparison Tables (ASTM ℃KS, JIS, DIN, BS, NBN, NF, UNI)

A 179 Seamless Cold Drawn Low-C Steel Heat Exchanger and Conderser Tubes

ASTM	UNS NO.	KOREA/JAPANES			GERMAN				BRITISH			BELGIAN			FRENCH			ITALIAN
ASTM	UNS NO.	KS/JIS Symbol	KS/JIS Numbe	Re	DIN Type	DIN	Materiral Number	Re	B.S	B.S Grade	Re	NBN Type	NBN Grade	Re	AF	NF	Re	UNI Type	UNI	Re
ASTM A179	K01200	STBH 340 / STB 35	D3563 / G3461		St 35.4	1629	1.0309		3606	CFS 320		D 37-2	629	(3b)	TU 37 C	A49-215	(3a)	C 14	5462
ASTM A179					St 35.8	17175	1.0305	Plus DIN 2391 Gutegard C.NBK							TU 37 C	A49-215	(3a)	C 14	5462

U-Bend Fabrication Tolerances:

Item	Condition (when)	Tolercance
	Nominal bend radius ≤ 2 x nominal OD	less than or equal to 12%
Ovality	2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD	less than or equal to 10%
	Nominal bend radius > 4 x nominal OD	less than or equal to 5%
	Nominal bend radius ≤ 2 x nominal OD	0.75 x nominal wall
Mimimum wall thickness	2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD	0.8 x nominal wall
	Nominal bend radius > 4 x nominal OD	0.9 x nominal wall
	Nominal bend radius ≤ 8" (200mm)	+/-3/64"(1mm)
Bending Radius	8" (200mm) < Nominal bend radius ≤ 16" (400mm)	+/-1/16"(1mm)
	Nominal bend radius >16" (400mm)	+/-5/64"(1mm)
Disrance between legs		Max 1/16"(1.5mm)
Wall thinning of bending area		Max 17%
Difference between leg lengths at the ends	Leg length ≤ 16' (4.88m)	+1/8"(3mm)
Difference between leg lengths at the ends	Leg length > 16' (4.88m)	+3/16"(5mm)
Deviation from plane of bend		≤ 3/16"(1.5mm)
Flattening on bend		≤ 10% nominal diameter
Straight leg length	≤5m	+1/8"(3mm)
Straight leg length	>5m	+3/16(5mm)
Total tube length including radius	≤6m	+3/16(5mm)
Total tube length including radius	>6m	+5/16"(8mm)

Tech & Service of Seamless pipe

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.

How to make seamless pipe(seamless pipe process)?

Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.

Precision cold drawn steel tube production process

Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.

How to calculate a steel pipe and tube theoretic weight

Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.

Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.

Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.

Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.

Condition on delivery:

Cold-finished/hard
(cold-finished as-drawn)

No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.

Cold-finished/soft
(lightly cold-worked)

BKW

After 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.

Annealed

GBK

After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.

Normalized

NBK

The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

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