Application of Stainless Steel Stub End

zhao77jie — Wed, 10 Jul 2024 08:38:39 +0000

Stainless steel stub end is a type of butt welded pipe fittings. It usually used in conjunction with lap joint flange to achieve flange connection in pipeline systems. The stub end section is generally formed by stamping technology. It’s divided into long and short stub end according to the length of the straight pipe end. The selection of forming methods confirms that the product is not damaged. Some large diameter flanges still require welding technology. The production standards for stub end mainly comply with the American production standards ANSI/ASME B16.9 and MSS SP-43.

ASME B16.9 stainless steel stub end can be divided into long and short stub ends based on their length.

Type	Long Pattern (LP) and Short Pattern (SP)
Size Range	1/2” – 24” / DN15 – 600
Thickness Schedule	SCH10S/SCH40S/SCH80S
China Standard	GB/T12459, GB/T13401, HG/T21635/21631, SH3408/3409
America Standard	ANSI / ASME B16.9 / MSS SP 43
Japan Standard	JIS B2311/2312/2313
Germany Standard	DIN2605/2615/2616/2617
Europe Standard	EN10253
Stainless Steel	ASTM A403 WP304/304L/304H, 316/316L, 310S, 317,347,904L
Duplex Stainless Steel	ASTM A815 S32205, S31803, 32750, 32760

Material Standard for Stainless Steel Stub End

Stainless steel stub ends are produced using high-quality stainless steel materials. Stainless steel mainly have characteristics such as corrosion resistance, high temperature resistance, and stable performance. They are suitable for various types of pipeline systems and application environments. The common stainless steel material standard is the American standard ASTM A403. This standard includes different grades of stainless steel, such as ASTM A403 WP304/316, etc.

Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo
ASTM A403 WP304	MIN						8.0	18.0
ASTM A403 WP304	MAX	0.08	2.00	0.045	0.030	1.00	11.0	20.0
ASTM A403 WP316	MIN						10.0	16.0	2.00
ASTM A403 WP316	MAX	0.08	2.00	0.045	0.030	1.00	14.0	18.0	3.00

Mechanical Properties

MATERIAL	ASTM A403 WP304	ASTM A403 WP316
T.S (MPA)	515 min	515 min
Y.S (MPA)	205 min	205 min
EL %	28 min	28 min

ASME B16.9 Specification

ASME B16.9 is one of the main manufacturing standards for stainless steel stub end. This standard specifies key parameters such as dimensions, tolerances, material requirements, and inspection methods for stub end. In specifications, the size range of stub end is from 1/2 “to 24”. It can meet the connection requirements of pipes with different diameters.

Dimension of ASME B16.9 Stainless Steel Stub End

DN	NPS	OD		F		R		G
DN	NPS	Max.	Min.	Long Type	Short Type	A	Bmax	G
15	1/2	22.8	20.5	76	51	3	0.8	35
20	3/4	28.1	25.9	76	51	3	0.8	43
25	1	35.0	32.6	102	51	3	0.8	51
32	11/4	43.6	41.4	102	51	5	0.8	64
40	11/2	49.9	47.5	102	51	6	0.8	73
50	2	62.4	59.5	152	64	8	0.8	92
65	21/2	75.3	72.2	152	64	8	0.8	105
80	3	91.3	88.1	152	64	10	0.8	127
90	31/2	104.0	100.8	152	76	10	0.8	140
100	4	116.7	113.5	152	76	11	0.8	157
125	5	144.3	140.5	203	76	11	1.6	186
150	6	171.3	167.5	203	89	13	1.6	216
200	8	222.1	218.3	203	102	13	1.6	270
250	10	277.2	272.3	254	127	13	1.6	324
300	12	328.0	323.1	254	152	13	1.6	381
350	14	359.9	354.8	305	152	13	1.6	413
400	16	411.0	405.6	305	152	13	1.6	470
450	18	462.0	456.0	305	152	13	1.6	533
500	20	514.0	507.0	305	152	13	1.6	584
550	22	565.0	558.0	305	152	13	1.6	641
600	24	616.0	609.0	305	152	13	1.6	692

Stainless Steel Stub End Referenced Weight List

Nominal Size		SCH10S		SCH40S		SCH80S
DN	NPS	Short Pattern	Long Pattern	Short Pattern	Long Pattern	Short Pattern	Long Pattern
15	1/2	0.07	0.09	0.09	0.12	0.12	0.16
20	3/4	0.09	0.12	0.12	0.16	0.15	0.21
25	1	0.15	0.25	0.18	0.32	0.24	0.43
32	1-1/4	0.19	0.34	0.25	0.43	0.33	0.57
40	1-1/2	0.22	0.39	0.31	0.52	0.43	0.75
50	2	0.35	0.71	0.52	1.02	0.73	1.49
65	2-1/2	0.46	0.95	0.81	1.6	1.1	2.22
80	3	0.62	1.22	1.1	2.11	1.5	2.98
90	3-1/2	0.7	1.36	1.52	2.55	2.09	3.65
100	4	0.94	1.59	1.8	3.05	2.58	4.44
125	5	1.3	2.8	2.25	5.42	3.6	7.86
150	6	1.75	3.3	3.59	7.02	5.76	11.3
200	8	2.9	4.95	5.98	10.6	9.18	16.2
250	10	4.79	8.5	10.2	18.4	13.7	24.9
300	12	7.2	10.9	14.9	22.8	19.5	30.2
350	14	7.95	15	15.8	28.7	21.6	38.6
400	16	9.5	17.3	18.9	33.1	25.2	44.5
450	18	11.1	19.8	22	38	29.3	51.1
500	20	14.1	25.9	24.3	42.3	32.6	56.8
550	22	16.5	28.2	–	–	–	–
600	24	19.8	35	29.6	51.2	39.7	68.8

Features and Advantages

Convenient Connection

Good Sealing Performance

Strong Adaptability

Application and Precaution

ASME B16.9 stainless steel stub end is widely used in pipeline systems in industries such as petroleum, chemical, and natural gas. Especially in situations that require frequent disassembly and maintenance, such as oil refineries, chemical plants, and natural gas transmission pipelines.

Choose the Appropriate Material

Pay Attention to Size Matching

Adhere to Manufacturing Standards

ASME B16.9 stainless steel stub end is an important type of pipeline connector, widely used in industries. Understanding its definition, classification, materials, specifications, manufacturing standards, and application precautions is of great significance for ensuring the safe operation of pipeline systems.

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