ASTM A688 / A688M Welded Austenitic Stainless Steel Feedwater Heater Tubes

Type: Stainless Steel Pipes Grade: 300 Series Shape: U Channel Surface Treatment: Bright Standard: ASTM, AISI Certification: ISO, SGS, ASTM Technique: Cold Rolled Origin: China ASTM A688 / A688M Welded Austenitic Stainless Steel Feedwater Heater Tubes
Standard: ASTM A688/A688M
Grade: 304, 304L, 316, 316L,XM-29 etc.
Size :   OD :6-50.8mm ( 1/4"-2")    Wall Thickness : 0.4-2.0mm
Application: Welded Austenitic Stainless Steel Feedwater Heater Tubes
 
Chemical Composition:

Elem-ent	Grade	TP304	TP304L	TP304LN	TP316	TP316L	TP316LN	TP XM-29	TP 304N	TP 316N	---	--	---	---
%	UNS designation	S30400	S30403	S30453	S31600	S31603	S31653	S24000	S30451	S31651	N08367	N08926	S31254	S32654
C, max		0.08	0.035	0.035	0.08	0.035	0.035	0.060	0.08	0.08	0.030
Mn, max		2.00	2.00	2.00	2.00	2.00	2.00	11.50-14.50	2.00	2.00	2.00
Ph, max		0.040	0.040	0.040	0.040	0.040	0.040	0.060	0.040	0.040	0.040
S, max		0.030	0.030	0.030	0.030	0.030	0.030	0.030	0.030	0.030	0.030
Si,,max		0.75	0.75	0.75	0.75	0.75	0.75	1.00	0.75	0.75	1.00
Ni		8.00-11.00	8.00-13.00	8.00-13.00	10.00-14.00	10.00-15.00	10.00-15.00	2.25-3.75	8.00-1.00	10.00-14.00	23.50-25.50
Cr		18.00-20.00	18.00-20.00	18.00-20.00	16.00-18.00	16.00-18.00	16.00-18.00	17.00-19.00	18.00-20.00	16.00-18.00	20.00-22.00
Mo		---	---	---	2.00-3.00	2.00-3.00	2.00-3.00	---	---	2.00-3.00	6.00-7.00
N		---	---	0.10-0.16	---	---	0.10-0.16	0.20-0.40	0.10-0.16	0.10-0.16	0.18-0.25
Cu		---	---	---	---	---	---	---	---	---	0.5-1.5

Size Tolerance:
Tube Leg Length Tolerance

Leg Length, ft (m)	Plus Tolerance, in (mm)
<=20 (6)	1/8  (3.2)
>20(6), <=30(9)	5/32  (4.0)
>30 (9), <=40 (12.2)	3/16  (4.8)

 
Squareness of Ends Tolerance

Tube OD, in, (mm)	Tolerance, in, (mm)
<=5.8 (15.9)	0.010 (0.25)
>5.8 (15.9), <=1 (25.4)	0.016 (0.4)

 

Mechanical Property:

Grade	304 316	304L 316L	XM-29	304N 316N	304LN 316LN	---		---
UNS GRADE	S30400 S31600	S30403 S31603	S24000	S30451 S31651	S30453 S31653	N08367 t<=0.187	N08367 t>0.187	N08926	S31254 t<=0.187	S31254 t>0.187	S32654
tensile strength, min ksi (MPa)	75 (515)	70 (485)	100 (690)	80 (550)	75 (515)	100(690)	95 (655)	94 (650)	100 (690)	95 (655)	120 (825)
Yield strength, min ksi (MPa)	30 (205)	25 (175)	55 (380)	35 (240)	30 (205)	45 (310)	45 (310)	43(295)	45 (310)	45 (310)	65(450)
Elongation in 2 in. or 50mm, min, %	35	35	35	35	35	30	30	35	35	35	40

 

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