ASTM A268 Tp410 / Tp430 / Tp439 Stainless Steel Tube

• Customization: Available
• Type: Stainless Steel Pipes
• Standard: ASTM, AISI, GB, JIS, DIN, EN
• Model NO.: KM-307
• Certification: ISO, RoHS, IBR
• Shape: Round
• Technique: Cold Rolled
• Surface Treatment: Pickling
• Lenght: 3~12m or as Required
• MOQ: 500kgs
• Certificate: ISO ,Ce,SGS,BV
• Surface: Annealing, Pickling, Polishing, Bright, Sand Blas
• Delivery Times: 15 Days
• Thickness: Sch5s~Sch160,Xxs
• Transport Package: Standard Export Sea-Worthy Packing
• Specification: 1/2"~64"
• Trademark: KINGMETAL
• Origin: Chinese Main Port
• Production Capacity: 1000 Tons / Month

Product Description

ASTM A268 TP410 / TP430 / TP439 Stainless Steel Tube

ASTM A268 is Standard specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service, the grades contain TP410, TP405, TP420, TP430, TP430Ti, TP403, TP409, TP444, TP439 and TP446, it covers standard specification for a number of grades of nominal-wall-thickness, welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service, ASME SA268 is alternative standard.

The tubes shall be made by the seamless or welded process with no filler metal added, tubes shall be reheated to a temperature of 1200^.F [650^.C] or higher and cooled to meet the requirements of this specification, All tubes shall be free of excessive mill scale, suitable for inspection. A slight amount of oxidation will not be considered as scale.

ASTM A268 Stainless Steel Tubing Specification

Standard	ASTM A268, ASME SA268
Tube Type	Both Welded And Seamless
Grades	ASTM A268 TP 410, ASTM A268 TP 430, ASTM A268 TP 439
Outside Diameter	1/4″ (6.25mm) To 8″ (203mm)
Wall Thickness	0.02″ (0.5mm) To 0.5″(12mm)
Application	Heat Exchanger, Heater, Condenser

 

ASTM A268 TP410, TP430, TP439 Chemical Composition

The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, aluminum, copper, nitrogen, titanium, and columbium, most of these grades are commonly characterized by being ferromagnetic.

Grade:	TP410	TP430	TP439
UNS	S41000	S43000	S43035
C, Max	0.15	0.12	0.07
Mn,Max	1.00	1.00	1.00
P, Max	0.04	0.04	0.040
S, Max	0.03	0.03	0.030
Si, Max	1.00	1.00	1.00
Ni	…	…	0.50max
Cr	11.5-13.5	16.0-18.0	17.00-19.00
Mo	…	…	…
Al	…	…	0.15
Cu	…	…	…
N	…	…	0.04
Ti	…	…	0.20+4(C+N)Min, 1.10max

ASTM A268 mainly contains 400 series Ferritic and Martensitic stainless steel grades, without or with slight Nickel element, so they have advantages on price compared to 304 or 316L stainless steel, that is the common used grade.

ASTM A268 Stainless Steel Tubing Sizes Tolerance

Variations in outside diameter, wall thickness, and length from those specified shall not exceed the amounts prescribed below.

Outside Diameter, In.[Mm]	OD Tolerance, In.[Mm]	Wall Thickness, %	Thin Wall Tubes
Up To1⁄2, [12.7], Excl	±0.005 [0.13]	±15
1⁄2 To 11⁄2 [12.7 To 38.1], Excl/Td>	±0.005 [0.13]	±10<	Less Than 0.065 In. [1.6 Mm] Nominal
11⁄2 To 31⁄2 [38.1 To 88.9], Excl	±0.010 [0.25]	±10	Less Than 0.095 In. [2.4 Mm] Nominal
31⁄2 To 51⁄2 [88.9 To 139.7], Excl	±0.015 [0.38]	±10	Less Than 0.150 In. [3.8 Mm] Nominal
51⁄2 To 8 [139.7 To 203.2], Incl	±0.030 [0.76]	±10	Less Than 0.150 In. [3.8 Mm] Nominal

Tests

The steel shall conform to the following tensile properties: tensile strength, yield strength, and elongation.

Grade	Tensile Strength, Min, Ksi [MPa]	Yield Strength, Min, Ksi [MPa]	ELONGATION. MIN, %
TP410	55 [380]	30 [205]	20
TP430	60 [415]	35 [240]	20
TP439	60 [415]	30 [205]	20

The tubes shall have a hardness number that will not exceed the prescribed Brinell and Rockwell hardness values, TP410, TP430 and TP439 max Rockwell hardness 90, Test report required certification conform to Specification A1016/A1016M.

Several mechanical tests shall be conducted, namely:

• Tension test;
• Flaring test (for seamless tubes);
• Flange test (for welded tubes);
• Hardness test;
• Reverse flattening test;
• Intergranular corrosion test; and
• Hydrostatic or nondestructive electric test.