ASTM A213 Grade TP316Ti UNS S31635 Seamless Austenitic Stainless Steel Tubes For Boiler, Superheater, and Heat Exchanger

ASTM A213 Grade TP316Ti UNS S31635 Seamless Austenitic Stainless Steel Tubes For Boiler, Superheater, and Heat Exchanger

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Quick Details

Steel Grade:: Austenitic

Surface Finish:: Mill finish

Invoicing:: by actual weight

Place of Origin:: EU and China

Brand Name:: Dwells AB

Model Number:: DST31635

Application:: Pharma, Food & Chem, Oil & Gas, Power Gen, Marine

Outer Diameter:: 6.35mm, 6.35 - 101.6 mm

Delivery Time:: Lead time varies with quantity

Length:: Cut Length | SRL | DRL

Pipe Ends:: Plain Ends | Threaded Ends | Bevelled Ends | Grooved Ends

Quick Details

Type:: Seamless

Tolerance:: ASTM A1016

Grade:: TP316Ti

Steel Grade:: Austenitic

Surface Finish:: Mill finish

Invoicing:: by actual weight

Place of Origin:: EU and China

Brand Name:: Dwells AB

Model Number:: DST31635

Application:: Pharma, Food & Chem, Oil & Gas, Power Gen, Marine

Outer Diameter:: 6.35mm, 6.35 - 101.6 mm

Delivery Time:: Lead time varies with quantity

Length:: Cut Length | SRL | DRL

Pipe Ends:: Plain Ends | Threaded Ends | Bevelled Ends | Grooved Ends

Standard and Grade

ASTM A213/A213M

Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.

TP316Ti UNS S31635

An enhanced grade of TP316 stabilized with titanium, a crucial addition that minimizes the formation of chromium carbides and enhances its resistance to intergranular corrosion. Notably, in the damp industrial, these steels outperform TP 304/304L and ferritic grades. While they provide limited resistance to pitting in low-temperature seawater, they remain susceptible to crevice attack. What sets them apart are their impressive properties over both short and long periods at elevated temperatures, surpassing those of comparable TP 304/304L grades.

Manufacturing Processes

The raw material for stainless steel seamless pipe is typically a billet, which is a solid round bar of stainless steel. The billet is heated in a furnace to make it more pliable, then pierced by a mandrel, which is a solid rod that is slightly smaller than the inner diameter of the desired pipe. The mandrel is forced through the billet, creating a hollow cylinder.

The pierced billet is then rolled over a series of rollers to reduce its diameter and increase its wall thickness, the rollers are shaped in such a way that they gradually reduce the size of the opening in the center of the pipe, while also increasing the thickness of the walls.

Once the pipe has reached the desired diameter and wall thickness, it is sized to ensure that it meets the required specifications, this may involve using a sizing mill or other specialized equipment.

_{FIG. 1 A Stack of Stainless Steel Billets} .

_{FIG. 2 Inspecting and Preparing the Stainless Steel Billets}

_{FIG. 3 The Loading Stainless Steel Billets into The Furnace}

_{FIG. 4 Piercing The Stainless Steel Billet}

Chemical Composition

Grade

UNS Designation

Composition, % ^A

Grade

UNS Designation

TP316Ti

S31635

0.08

2.00

0.045

0.030

0.75

16.0 - 18.0

10.0 - 14.0

2.00 - 3.00

Continued

0.10

5 x (C + N) - 0.70

^A Maximum, unless otherwise indicated.

Heat Treatment & Tensile Properties

Heat Treatment
Grade	UNS Number	Heat Treat Type	Austenitizing/ Solutioning Temperature, min or range °F [°C]	Cooling Media
TP316Ti	S31635	solution treatment	1900°F [1040°C] ^A	water or other rapid cool

^A Quenched in water or rapidly cooled by other means.

Tensile Strength and Hardness

Garde

UNS Designation

Tensile
Strength, min
ksi [MPa]

Yield
Strength, min
ksi [MPa]

Elongation in 2 in. or 50 mm, min, %

Hardness ^A

Yield

Strength, min

ksi [MPa]

Elongation in 2 in. or 50 mm, min, % ^B,C

Brinell/Vickers

Rockwell

TP316Ti

S31635

75 [515]

30 [205]

192 HBW/ 200 HV

90HRB

^A Max, unless a range or a minimum is specified .

Dimensions & Permitted Variation

Tube dimensions are key features of tubes, and they are defined by two main measurements: outside diameter (OD) and wall thickness (WT), t ubing wall thickness (WT) can be measured using a BWG which ranges from 0 (heaviest) to 24 (lightest), corresponding to a range of wall thicknesses Below are some common outside diameters and wall thicknesses of A213 tubes:

OD in. [mm]	^5/8 [15.88] ^3/4 [19.05] 1 [25.4] 1 ^1/2 [38.1] 2 [50.8] 2 ^1/2 [63.5] 3 [76.2] 3 ^1/2 [88.9] 4 [101.6]
WT BWG [ i n. ] [mm]	20 [ 0.035 ] [0.889] 18 [ 0.049 ] [1.245] 16 [ 0.065 ] [1.651] 14 [ 0.083 ] [2.11] 12 [ 0.109 ] [2.769] 10 [ 0.134 ] [3.404]

Permitted Variations in Mass Per Foot ^A
Method of Manufacture	Permitted Variation in Mass per Foot, %
	Over	Under
Seamless, hot-finished
	16	0
Seamless, cold-finished
1 ^1⁄2 in. [38 mm] and under OD	12	0
Over 1 ^1⁄2 in. [38 mm] OD	13	0

^A These permitted variations in mass apply to lots of 50 tubes or more in sizes 4 in. [101.6 mm] and under in outside diameter, and to lots of 20 tubes or more in sizes over 4 in. [101.6 mm] in outside diameter.

Permissible variations from the specified minimum wall thickness shall be in accordance with Specification A1016/A1016M

Permitted Variations in Wall Thickness ^A
Wall Thickness, %										Wall Thickness, %
Outside Diameter in. [mm]	0.095 [2.4] and Under			Over 0.095 to 0.150 [2.4 to 3.8], incl			Over 0.150 to 0.0180 [3.8 to 4.6], incl		Over 0.180 [4.6]
	Over	Under	Over	Under	Over	Under	Over	Under
Seamless, Hot-Finished Tubes
4 [100] and under	40	0	35	0	33	0	28	0
Over 4 [100]	...	...	35	0	33	0	28	0
Seamless, Cold-Finished Tubes
					Over	Under
1 ^1⁄2 [38.1] and under					20	0
Over 1 ^1⁄2 [38.1]					20	0
All sizes					18	0

^A These permitted variations in wall thickness apply only to tubes, except internal-upset tubes, as rolled or cold finished, and before swaging, expanding,bending, polishing, or other fabricating operations.

For tubes 2 in. [50 mm] and over in outside diameter and 0.220 in. [5.6 mm] and over in thickness, the variation in wall thickness in any one cross section of any one tube shall not exceed the following percentage of the actual mean wall at the section. The actual mean wall is defined as the average of the thickest and thinnest wall in that section.

Seamless tubes ±10 %

When cold-finished tubes as ordered require wall thicknesses ^3⁄4 in. [19.1 mm] or over, or an inside diameter 60 % or less of the outside diameter, the permitted variations in wall thickness for hot-finished tubes shall apply.

Permissible variations from the specified average wall thickness shall be ±10 % of the specified average wall thickness for cold formed tubes and, for hot formed tubes shall be in accordance with the table below.

Permitted Variations in Average Wall Thickness for Hot Formed Tubes
	Tolerance in %, from specified
NPS [DN] Designator	Over	Under
^1/8 to 2 ^1/2 [6 to 65] incl., all t/D ratios ^A	20.0	12.5
Above 2 ^1⁄2 [65], t/D ≤ 5 % ^A	22.5	12.5
Above 2 ^1⁄2 [65], t/D > 5 % ^A	15.0	12.5

^A t = specified wall thickness D = specified wall thickness

Permitted Variations in Outside Diameter
Specified Outside Diameter,in. [mm]	Permitted Variations, in. [mm]
Specified Outside Diameter,in. [mm]	Specified Outside Diameter,in. [mm]	Over	Under
Hot-Finished Seamless Tubes
4 [100] or under	^1⁄64 [0.4]	^1/32 [0.8]
Over 4 to 7 1 ⁄ 2 [100 to 200], incl	^1⁄64 [0.4]	^3/64 [1.2]
Over 7 1 ⁄ 2 to 9 [200 to 225], incl	^1⁄64 [0.4]	^1/16 [1.6]
Cold-Finished Seamless Tubes
Under 1 [25]	0.004 [0.1]	0.004 [0.1]
1 to 1 1 ⁄ 2 [25 to 40], incl	0.006 [0.15]	0.006 [0.15]
Over 1 1 ⁄ 2 to 2 [40 to 50], excl	0.008 [0.2]	0.008 [0.2]
2 to 2 1 ⁄ 2 [50 to 65], excl	0.010 [0.25]	0.010 [0.25]
2 1 ⁄ 2 to 3 [65 to 75], excl	0.012 [0.3]	0.012 [0.3]
3 to 4 [75 to 100], incl	0.015 [0.38]	0.015 [0.38]
Over 4 to 7 1 ⁄ 2 [100 to 200], incl	0.015 [0.38]	0.025 [0.64]
Over 7 1 ⁄ 2 to 9 [200 to 225], incl	0.015 [0.38]	0.045 [1.14]

Permitted Variations in Length ^A
Method of Manufacture	Specified Outside Diameter, in.[mm]	Cut Length, in. [mm]
Method of Manufacture	Specified Outside Diameter, in.[mm]			Over	Under
Seamless, hot-finished	All sizes	^3⁄16 [5]	0 [0]
Seamless, cold-finished	Under 2 [50.8]	^1⁄8 [3]	0 [0]
Seamless, cold-finished		Under 2 [50.8]	^3⁄16 [5]	0 [0]

^A These permitted variations in length apply to tubes before bending. They apply to cut lengths up to and including 24 ft [7.3 m]. For lengths greater than 24 ft [7.3m], the above over-tolerances shall be increased by 1 ⁄ 8 in. [3 mm] for each 10 ft [3m] or fraction thereof over 24 ft or 1 ⁄ 2 in. [13 mm], whichever is the lesser.

Straightness Tolerances
Specified OD, in.	Specified Wall Thickness, in.	Maximum Curvature in any 3 ft, in.	Maximum Curvature in Total Length, in.
Up to 5.0, incl.	Over 3 % OD to 0.5, incl.	0.030	0.010 × length, ft
Over 5.0 to 8.0, incl.	Over 4 % OD to 0.75 incl.	0.045	0.015 × length, ft
Over 8.0 to 12.75, incl.	Over 4 % OD to 1.0, incl.	0.060	0.020 × length, ft

Inspection & Tests

MTC offered as EN10204/3.1, quality control from raw material to final products, testing and inspection comply with specification, standard testing and optional testing as following, The third party testing accepted, like TUV, SGS, INTERTEC and BV, to ensure our products high quality.

- Mechanical Tests

- Grain Size Determinations
- Transverse or Longitudinal Tension Test

- Flange Test

- Flaring Test
- Grain Size
- Hydrostatic or Nondestructive Electric Test
- Flattening Test (optional)
- Radiographic Examination (optional)
- Intergranular Corrosion Test (optional)