Carbon Steel Stub Ends are widely used pipe fittings designed for use with lap joint flanges, offering a reliable and economical solution for industrial pipelines. The stub end is welded to the pipe while the lap joint flange remains loose, allowing easier alignment during installation and reducing stress on the pipeline.

Manufactured according to ASME B16.9 and MSS-SP-43 standards, carbon steel stub ends are typically produced from materials such as ASTM A234 WPB, ASTM A420 WPL6, and other carbon steel grades. These materials provide excellent mechanical strength, high temperature resistance, and suitability for both pressure and structural piping systems.

Carbon steel stub ends are available in both short pattern and long pattern designs, ranging from 1/2” to 48” (DN15 to DN1200), with wall thicknesses from SCH 10 to SCH 160. They are suitable for pressure classes from 150# to 2500#. Surface treatments such as black painting, anti-rust oil, or galvanizing are commonly applied to enhance resistance against corrosion and oxidation.

Compared to stainless steel stub ends, carbon steel stub ends provide an economical option for large-diameter or high-pressure pipelines where superior strength is required but full stainless steel corrosion resistance is not necessary. They are widely used in oil & gas pipelines, boiler systems, petrochemical plants, and power generation industries.

Their design reduces installation costs, simplifies alignment, and allows for easy dismantling, making carbon steel stub ends a reliable and cost-effective solution for industrial piping connections.

Chemical Composition of ASTM A234 WPB
Element	Composition (%)
Carbon (C)	≤0.30
Manganese (Mn)	0.29 – 1.06
Phosphorus (P)	≤0.050
Sulfur (S)	≤0.058
Silicon (Si)	≥0.10

Mechanical Properties of ASTM A234 WPB
Property	Value
Tensile Strength, min (MPa)	415
Yield Strength, min (MPa)	240
Elongation, min (%)	20
Hardness, max (HBW)	≤197

Comparison of Carbon Steel Stub Ends with Other Grades
Feature	ASTM A234 WPB (Carbon Steel)	ASTM A403 WP304 (Stainless Steel)	ASTM A815 UNS S31803 (Duplex)
Material Type	Carbon Steel	Stainless Steel	Duplex Stainless Steel
Temperature Range	Up to 427°C	Up to 870°C	Up to 600°C
Corrosion Resistance	Moderate (With coatings)	Excellent	Superior (Pitting resistance)
Applications	Boilers, general piping	Chemical, food processing	Oil/gas, marine
Tensile Strength (MPa)	415 (min)	515 (min)	620 (min)
Yield Strength (MPa)	240 (min)	205 (min)	450 (min)
Key Advantage	Cost-effective	High corrosion resistance	High strength, corrosion resistance

You Can Also Search Carbon Steel Stub Ends by

A curated list of long-tail keywords for carbon steel stub ends, covering specifications, applications, and material properties, presented in a two-column layout.

Standards and Specifications

• ASME B16.9 carbon steel stub end specifications
• ASTM A234 WPB stub end standards
• Carbon steel stub end dimensions

Applications

• Carbon steel stub ends for boiler pipeline protection
• Welded stub ends for oil and gas pipelines
• Corrosion-resistant stub ends for chemical processing

Material and Grades

• Carbon steel stub end material properties
• ASTM A234 WPB welded stub ends grades
• Cost-effective fittings for industrial piping

Manufacturing and Testing

• Carbon steel stub end manufacturing process
• Welded stub ends non-destructive testing
• Corrosion-resistant stub ends quality standards

Procurement and Suppliers

• Carbon steel stub end suppliers
• Cost-effective fittings distributors
• Welded stub ends price for industrial use

Dimensions and Customization

• Carbon steel stub end dimensions
• Welded stub ends custom tolerances
• Industrial piping stub ends custom sizes

Note: Carbon steel stub ends comply with ASME B16.9 and ASTM A234 standards. For detailed specifications, refer to the relevant standards or contact a certified supplier.

Key Benefits

Easy Disassembly

Quick removal of piping sections without disturbing the entire system for maintenance and inspection.

Cost-Effective

Use expensive materials only where needed, with cheaper backing flanges reducing overall cost.

Flexibility in Alignment

Rotating backing flange allows easy alignment of bolt holes during installation.

Leak-Proof Connection

Properly welded and assembled stub ends provide secure and leak-proof joints.

Versatility

Compatible with various flange types and available in wide range of materials and sizes.

Quality Assurance

Manufactured to strict international standards with comprehensive testing and inspection.

Types of Stub Ends

By Design & Application

Type "A" Stub End

Description: Produced and machined specifically to fit lap joint flanges.

Matching profile surfaces
Radius outside corner
Squared inside corner
For lap joint flanges

Type "B" Stub End

Description: Suited for standard slip-on flanges acting as lap-joint flanges.

Serrated lap face
Tight joint sealing
ID side chamfers required
For slip-on flanges

Type "C" Stub End

Description: Versatile for both lap joint and slip-on backing flanges.

Flared lap design
75% pipe wall thickness
Short fillet outer radius
Fabricated from pipes

Type "CS" Stub End

Description: Similar to Type "C" with concentric serrations on lap face.

Concentric serrations
Enhanced sealing capability
Machined during manufacturing
Critical sealing applications

By Length Pattern

Long Pattern

Longer length for easier alignment and welding. Suitable for frequent disassembly applications.

Standard Lap Joint Flanges

Short Pattern

Similar length to pipe. Ideal for space-limited applications where flange needs to be close to pipe end.

Slip-On Flanges

Stu end geometry

In piping systems, a stub end is a crucial component used for connecting pipes of different materials and sizes. It provides a convenient and cost-effective solution for achieving a leak-free joint without the need for welding. In this article, we will explore the geometry, types, and applications of stub ends, shedding light on their significance in various industries and projects.

Pipe Fitting Dimensions
N.D.		Out diameter	Hight(F)		Stub end O.D.(G)		Beveld radio(R)
NPS	DN	OD	Mss	ANSI	Nominal&max	Nominal&min	A Max	B Max
1/2	15	21.3	50.8	76.2	35	34	3	0.8
3/4	20	26.7	50.8	76.2	43	42	3	0.8
1	25	33.4	50.8	101.6	51	50	3	0.8
1 1/4	32	42.4	50.8	101.6	64	63	4.8	0.8
1 1/2	40	48.3	50.8	101.6	73	72	6.4	0.8
2	50	60.3	63.5	152.4	92	91	7.9	0.8
2 1/2	65	73	63.5	152.4	105	104	7.9	0.8
3	80	88.9	63.5	152.4	127	126	9.6	0.8
3 1/2	90	101.6	76.2	152.4	140	139	9.6	0.8
4	100	114.3	76.2	152.4	157	156	11.2	0.8
5	125	141.3	76.2	203.2	186	185	11.2	1.6
6	150	168.3	88.9	203.2	216	215	12.7	1.6
8	200	219.1	101.6	203.2	270	269	12.7	1.6
10	250	273.1	127	254	324	322	12.7	1.6
12	300	323.9	152.4	254	381	379	12.7	1.6
14	350	355.6	152.4	304.8	413	411	12.7	1.6
16	400	406.4	152.4	304.8	470	468	12.7	1.6
18	450	457.2	152.4	304.8	533	531	12.7	1.6
20	500	508	152.4	304.8	584	582	12.7	1.6
22	550	559	152.4	304.8	641	639	12.7	1.6
24	600	610	152.4	304.8	692	690	12.7	1.6

How to order a Stub Ends

The following information shall be provided to order a stub end:

NPS
Schedule
Length (according to norms MSS SP43 / ASME B16.9 / custom)
Specs and material grade
Ends finish
Execution: seamless / welded (wx)

Stub end finish

Stub ends can be ordered with different ends finishing:

Beveled Ends
Squared Ends
Flanged Ends
Grooved Ends
Threaded Ends (Male Only)

Materials & Standards

Material Type	Standards & Grades	Characteristics	Applications
Carbon Steel	ASTM A234 WPB, A420 WPL6	High strength, cost-effective, good weldability	General industrial piping, oil & gas, power generation
Stainless Steel	ASTM A403 WP304/304L, WP316/316L	Excellent corrosion resistance, hygienic properties	Chemical processing, food & beverage, pharmaceutical
Alloy Steel	ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91	Enhanced strength, high-temperature resistance	High-temperature and high-pressure services

Manufacturing Standards

ASME B16.9

Butt Weld Fittings

MSS SP-43

Stainless Steel Fittings

ASME B16.25

Buttwelding Ends

JIS B2312/B2313

Japanese Standards

Carbon Steel Stub End