Stainless Steel Pipes

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To further understand more about stainless steel pipes, please see the information provided below:

Description:
Seamless cold drawn stainless steel pipes are made in accordance to ASTM A312 TP316/316L standards. The material of stainless steel pipe is available in dual grade which is SS316/316L which allows dual usage of tubes.

SS316 pipes are most supplied in high performance fluids application for its great corrosion resistance and for its ability to withstand higher pressure. Stainless steel pipe is available in one finishing, namely annealed and pickled.

The unit used in stainless steel pipes is Inch NB size range and thickness is in schedules (abbreviated as “SCH”). The unit SCH refers to the variation of thickness. There are three types of end connections for stainless steel pipes: plain end (PE), bevel end (BE), and threaded end (TE).

Features:

Inch NB Size Range: 1/8" to 4"
Thickness Range: SCH10S - SCHXXS
Dimension Standard: ASTM A312 / ASME SA312
Material: TP316 / TP316L
Working Pressure: As per DIN 2413 I Static Straight Pipe Specifications
Origin: Japan / China
Finishing: Annealed and Pickled

Recommended Bend Radius:
A bend radius of 3x the external tube diameter, is recommended for the tube’s cold bending using tube benders or by manual hand bending.

Welding Suitability:
Pipes made of TP316 and TP316L are suitable for arc welding using usual techniques. The welding should be selected in accordance with DIN EN 1600 and DIN EN 12072 part 1 taking into account the type of application and the welding technique.

Chemical Composition:
Chemical composition for ASTM A312/ASME SA312, TP316/TP316L dual grade seamless stainless steel pipe is as per the table below.

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	C	Mn	P	S	Si	Ni	Cr
Min.						11.0	16.0
Max.	0.035	2.000	0.045	0.030	1.000	14.0	18.0

Mechanical Properties of the tubes at room temperature:
Tensile Strength Rm: Minimum 515 N/mm²
Upper Yield Point Reh: Minimum 205 N/mm²
Elongation at rupture A5: Minimum 35%
Hardness Test: 75 HRB

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Stainless Steel Pipes Information

Stainless Steel Pipes Specification

One of the most supplied in Chuan Kok’s product range is stainless steel pipes. Stainless steel pipes are consumed in high performance fluid or gas line application. Most clients requests for seamless stainless steel pipes due to their corrosion resistance and ability to withstand pressure.

Introduction:
Chuan Kok keep stock for seamless stainless steel pipes in dual grade SS316/SS316L. The stainless steel pipes are in accordance to ASTM A312. ASTM A312 is the standard specification for seamless, welded, and heavily cold worked austenitic stainless steel pipe.

Stainless Steel Pipe Attributes:
The minimum tensile strength for stainless steel pipes is 515 N/mm² while minimum yield strength at Rp 0.2% at 205 N/mm². Stainless steel pipes contain at least 10.5% of chromium. This allows it to form an invisible chrome-oxide layer by reaction with oxygen.

SS316/316L is a chromium-nickel-molybdenum bearing austenitic stainless steel. The molybdenum content in stainless steel pipe is around 2.0% to 3.0%, while nickel content is around 11% to 14%. The nickel and molybdenum content provides great corrosion resistance in corrosive surroundings, such as salt water or chloride environments. In addition, SS316/316L material will reduce the tendency of the material to crack after welding. It also provides higher tensile strength at elevated temperature.

The meaning of “L” designation in SS316L grade is that carbon content is restricted to 0.03% where the normal carbon content in stainless steel SS316 is 0.08%. The lesser the carbon content the stainless steel has, the greater it is in weldability. And it also prevents chromium from being depleted, thus, it can still form the chrome oxide layer on the pipe surface.

Annealed & Pickled Stainless Steel Pipe

Stainless Steel Pipe Finishing:
Pipes are supplied in 1 type of finishing which is Annealed and Pickled. Annealing is a heat treatment that alters the physical and chemical properties of the material. It also increases the ductility and reduces the stainless steel pipe hardness. Pickling is a metal surface treatment that contains acid to remove the impurities on the pipe surface.

Stainless Steel Pipe’s Pipe Ends:
There are 3 main types of pipe ends for stainless steel pipe, namely plain end (PE), bevel end (BE) and threaded end (TE).

Plain end (PE) pipes are pipes that with unfinished ends. Generally, plain end pipes are used for small diameters pipe systems. It also suitable for socket weld fittings and flanges.

Bevel end (BE) pipes are pipes that have a standard angle of 30° (+5°/-0°) on the pipes end surface. It also has a root face of 1.6mm (±0.8mm). However, pipes with non-standard angles can also be produced. Bevel end pipes are usually used for butt weld fittings and flanges where they can be directly welded to each other. Picture of bevel end are illustrate in the product literature pdf file below.

Threaded end(TE) pipes are pipes that with tapered groove that cuts into the ends of pipes. The tapered groove allows the pipes to be easily assembled with threaded fittings. The standard thread for tapered groove is National Pipe Thread (NPT). As NPT connections are assembled, it will reduce the possibility of leakage.

Outer Diameter and Wall Thickness Specifications:
Pipes outer diameter (OD) is in accordance to ASTM A312. The tolerance of pipe outer diameter and wall thickness are as below:

Pipe Outer Diameter	ASTM A312 Outer Diameter Tolerance	ASTM A312 Wall Thickness Tolerance
1/8"NB - 1-1/2"NB	+0.4MM , -0.8MM	+/- 12.5%
2"NB - 4"NB	+/- 0.8MM	+/- 12.5%
5"NB - 8"NB	+1.6MM, -0.8MM	+/- 12.5%

From table above, for pipes OD that range from 1/8"NB – 1 1/2"NB, the standard OD tolerance is +0.4mm, -0.8mm. For Chuan Kok’s pipe sizes 1/8"NB – 1 1/2"NB, we control the OD tolerance to be ±0.4mm. For 2"NB - 4"NB, the standard OD tolerance is ±0.8mm to which our pipes comply. For 5"NB - 8"NB pipes, the standard OD tolerance is +1.6mm, -0.8mm.

For pipes wall thickness, the specifications are +/- 12.5%. However, we regulate the wall thickness to +/- 10%.

Stainless Steel Pipe Wall Thickness:
Wall thickness of stainless steel pipe is expressed in “schedules”, abbreviated as SCH. Thickness of stainless steel pipes can be divided to several groups such as SCH10S, SCH40S, SCH80S, SCH160S and SCHXXS. These represent different kind of thickness which depends on the pipe’s outer diameter (OD).

For more information regarding stainless steel pipes, please refer to en.wikipedia.org/wiki/Pipe_(fluid_conveyance)

Stainless Steel Pipe Dimensions and Pressure Ratings

Stainless Steel Pipes working pressures are calculated from ASME B31.1 standards, with values from AMSE B31.3.

Pipe Size NB (Inch)	Pipe Size NB	Outer Diameter OD(mm)	Wall Thickness (mm)	Schedule	Working Pressure (Bar)	Burst Pressure (Bar)
1/8	6	10.3	1.73	40S	474	1778
1/8	6	10.3	2.41	80S	698	2618
1/4	8	13.7	2.24	40S	460	1725
1/4	8	13.7	3.02	80S	650	2438
3/8	10	17.1	1.65	10S	263	870
3/8	10	17.1	2.31	40S	371	1391
3/8	10	17.1	3.20	80S	537	2014
1/2	15	21.3	2.77	40S	356	1335
1/2	15	21.3	3.73	80S	497	1864
1/2	15	21.3	4.75	160S	659	2471
1/2	15	21.3	7.47	XXS	1165	4369
3/4	20	26.7	2.87	40S	289	1084
3/4	20	26.7	3.91	80S	406	1523
3/4	20	26.7	5.56	160S	608	2280
3/4	20	26.7	7.82	XXS	921	3454
1	25	33.4	3.38	40S	271	1016
1	25	33.4	4.55	80S	375	1406
1	25	33.4	6.35	160S	547	2051
1	25	33.4	9.09	XXS	840	3150
1-1/4	32	42.2	3.56	40S	223	836
1-1/4	32	42.2	4.85	80S	311	1166
1-1/4	32	42.2	6.35	160S	419	1571
1-1/4	32	42.2	9.70	XXS	684	2565
1-1/2	40	48.3	3.68	40S	200	750
1-1/2	40	48.3	5.08	80S	282	1058
1-1/2	40	48.3	7.14	160S	411	1541
1-1/2	40	48.3	10.16	XXS	615	2306
2	50	60.3	2.77	10S	118	443
2	50	60.3	3.91	40S	169	634
2	50	60.3	5.54	80S	244	915
2	50	60.3	8.74	160S	402	1508
2	50	60.3	11.07	XXS	525	1969
2-1/2	65	73.0	3.05	10S	107	401
2-1/2	65	73.0	5.16	40S	185	694
2-1/2	65	73.0	7.01	80S	256	960
2-1/2	65	73.0	9.52	160S	357	1339
3	80	88.9	3.05	10S	87	326
3	80	88.9	5.49	40S	160	600
4	100	114.3	3.05	10S	68	255
4	100	114.3	6.02	40S	136	510

Stainless Steel Pipe Temperature Ratings

Elevated Temperature Rating Factor is calculated using as per ASME B31.3. Dual Grades such as TP316/316L meet the requirements for the lower maximum carbon content of the L grades and the higher minimum yield and tensile strength of the non-L grades.

°C	-60	93	204	315	426	537
Rating Factor	1.00	1.00	0.96	0.85	0.79	0.76

Stainless Steel Pipes Information (so you can make the right choice)

Catalogue available in pdf:

SS316 Pipes Catalogue

Stainless Steel Pipe Literature