ASTM A268 Stainless Steel Tubing

Short Description:

Standard: ASTM A240/A240M, ASTM A480/480M, AMS 5524, AMS 5507

Grade: 316, UNS S31600

Density: 7.98 x 103 Kg/m3

Width: 1000mm, 1200mm, 1220mm, 1500mm, 1800mm, 2000mm, 2200mm

Length: 2438mm, 3000mm, 6000mm, 8000mm, 12000mm

Thickness: 0.3 – 50mm

Manufacturing Process: Hot Rolled/Cold Roll

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Product Detail

Product Tags

ASTM A268 Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing

Introduction

ASTM A268 specification covers a number of grades of nominal-wall-thickness, welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service like heaters, burners, Petroleum Refining and Petrochemical Processing, Heat exchangers, Thermal Processing, Biomedical, food processing equipment, automotive exhausts, and hot water tanks and more.

Specification

Standard: ASTM A268/A268M-2022

Grade: TP405, TP410, TP429, TP430, TP443, TP446-1, TP446-2, TP409

Grade: TP439, S41500, S44400, S44700, S44635, TP468

Outside Diameter: 12.7 - 203.2mm

Wall Thickness: 0.4 - 8.0mm

Length: 3000 - 36000mm

Type: Straight Tube, U-Tube

TP405, TP410, TP429, TP430, TP443, TP446-1, TP446-2, TP409 Chemical Composition (wt%):

Grade	TP405	TP410	TP429	TP430	TP443	TP446–1	TP446–2	. . .	TP409
UNS No.	S40500	S41000	S42900	S43000	S44300	S44600	S44600	S40800	S40900
Element	Composition, %
C, max	0.08	0.15	0.12	0.12	0.2	0.2	0.12	0.08	0.08
Mn, max	1	1	1	1	1	1.5	1.5	1	1
P, max	0.04	0.04	0.04	0.04	0.04	0.04	0.04	0.045	0.045
S, max	0.03	0.03	0.03	0.03	0.03	0.03	0.03	0.045	0.03
Si, max	1	1	1	1	1	1	1	1	1
Ni	0.50 max	. . .	. . .	. . .	0.75 max	0.75 max	0.50 max	0.80 max	0.50 max
Cr	11.5–14.5	11.5–13.5	14.0–16.0	16.0–18.0	18.0–23.0	23.0–27.0	23.0–27.0	11.5–13.0	10.5–11.7
Al	0.10–0.30	. . .	. . .	. . .	. . .	. . .	. . .	. . .	. . .
Cu	. . .	. . .	. . .	. . .	0.90–1.25	. . .	. . .	. . .	. . .
N	...	...	...	...	...	0.25	0.25	...	...
Ti	...	...	...	...	...	...	...	12 x C min; 1.10 max	6 x C min; 0.75 max

TP439, S41500, S44400, S44700, S44635, TP468 Chemical Composition (wt%):

Grade	TP439	. . .	TPXM-27	18Cr-2Mo	29-4	29-4-2	26-3-3	25-4-4	TP468
UNS	S43035	S41500	S44627	S44400	S44700	S44800	S44660	S44635	S46800
Element	Composition, %
C, max	0.07	0.05	0.01	0.025	0.01	0.01	0.03	0.025	0.03
Mn,max	1	0.5–1.0	0.4	1	0.3	0.3	1	1	1
P, max	0.04	0.03	0.02	0.04	0.025	0.025	0.04	0.04	0.04
S, max	0.03	0.03	0.02	0.03	0.02	0.02	0.03	0.03	0.03
Si, max	1	0.6	0.4	1	0.2	0.2	1	0.75	1
Ni	0.50 max	3.5–5.5	0.5max	1.00 max	0.15 max	2.0–2.5	1.0–3.50	3.5–4.5	0.5
Cr	17.00–19.00	11.5–14.0	25.0–27.5	17.5–19.5	28.0–30.0	28.0–30.0	25.0–28.0	24.5–26.0	18.00–20.00
Mo	...	0.5–1.0	0.75–1.50	1.75–2.50	3.5–4.2	3.5–4.2	3.0–4.0	3.5–4.5	. . .
Al, max	0.15	. . .	...	...	...	...	...	...	. . .
Cu,max	...	. . .	0.2	...	0.15	0.15	...	...	. . .
N, max	0.04	. . .	0.015	0.035	0.020	0.020	0.04	0.035	0.03
Ti	0.20 + 4(C+ N) min; 1.1 max	...	...	(Ti + Cb) 0.20 + 4 (C + N) min; 0.8 max	...	...	(Ti + Cb)=0.20–1.00 and 6 x (C + N) min	(Ti + Cb) = 0.20 + 4 (C + N) min 0.8 max	0.07–0.30
Cb	...	. . .	0.05–0.20	...	...	...	...	...	0.10–0.60 (Ti + Cb)=0.2+4(C+N) min; 0.8 max

ASTM A268/A268M Stainless Steel Tubing Mechanical Properties:

_20220807141420

ASTM A268/A268M Stainless Steel Tubing Hardness requirements:

_20220807141632

Manufacture

The tubes shall be made by the seamless or welded process with no filler metal added.

Heat Treatment

As a final heat treatment, tubes shall be reheated to a temperature of 1200 °F [650 °C] or higher and cooled (as appropriate for the grade) to meet the requirements of this specification.

The martensitic grade UNS S 41500 shall be reheated to a temperature of 950 °F [510 °C] or higher and cooled as appropriate to meet the requirements of this specification.

Surface Condition

All tubes shall be free of excessive mill scale, suitable for inspection. A slight amount of oxidation will not be considered as scale. Any special finish requirements shall be subject to agreement between the manufacturer and the purchaser.

Product Marking

In addition to the marking described in Specification A1016/A1016M, the marking shall indicate whether the tubing is seamless or welded. Marking Sample:

LINKUN ASTM A268/A268M UNS S44400 SMLS 44.5 X 4 X 12000MM HEAT NO. XXXXXX MADE IN CHINA

Packing

1. Covered with seaworthy bags, hexagonal bundled.

2. Packed in plywood boxes/wooden crates.

3. Packed in steel-framed boxes.

Linkun is one of the leading China Stainless Steel Pipe And Tube manufacturers and suppliers, if you want to buy or import best high-quality astm a268 stainless steel tubing professional company, factory, seller, and exporter, or if you are checking steel brands, please feel free to contact us.