ASTM A234 WP11 Elbow for High-Temperature Piping Solutions

ASTM A234 WP11 Elbows are high-quality alloy steel pipe fittings designed for high-temperature piping systems, compliant with ASME B16.9 standards. These seamless or welded elbows provide excellent corrosion resistance and erosion resistance, making them ideal for boiler pipeline protection in refineries, petrochemical plants, and power generation facilities.

ASTM A234 WP11 elbows are manufactured through hot-forming or cold-forming processes, followed by normalizing and tempering heat treatments to enhance strength and toughness at temperatures up to 620°C. With chromium (1.00-1.50%) and molybdenum (0.44-0.65%) content, they offer robust resistance to oxidation, creep, and wear from corrosive fluids and abrasive slurries. Available in long-radius (LR, R=1.5D), short-radius (SR, R=1D), and reducing configurations, these elbows support angles of 90°, 45°, and 22.5° for versatile industrial piping designs.

These elbows support welding, bending, and flanging, with recommended preheating (150-200°C) and post-weld heat treatment (620-675°C) to ensure weld integrity. Available in sizes from 1/2” to 24” (DN15 to DN600) and wall thicknesses from SCH 40 to SCH 160, they meet diverse pipeline requirements. Rigorous testing, including tensile, flattening, and hydrostatic tests, ensures compliance with ASTM A234 standards for high-temperature service.

Enhanced with coatings like 3LPE, FBE, or galvanizing, ASTM A234 WP11 elbows provide superior corrosion resistance, protecting against rust and chemical degradation in high-temperature environments. Their creep strength makes them ideal for boiler pipeline protection in power plants, superheaters, and petrochemical processing.

For engineers seeking reliable high-temperature piping solutions, ASTM A234 WP11 elbows deliver exceptional durability, safety, and longevity, addressing challenges like pipeline corrosion, thermal stress, and high-pressure demands.

Construction Materials

What is A234 WP11 Fittings?

A234 WP11 Fittings can effectively be bent and welded.

ASME SA 234 wp11 that shape important associations between different pipes of different sizes. Elbow A234 WP11 is the free machining adaptation of this grade, accessible in bar shape for utilizing in automatic screw machines.

W = WELDABLE / wrought
P = RELATED TO P NUMBER OF ALLOY MATERIAL
B = REFER TO MINIMUM YIELD OF MATERIAL

Chemical Composition of ASTM A234 WP11 Elbow
Element	Composition (%)
Carbon (C)	≤0.15
Manganese (Mn)	0.30-0.60
Phosphorus (P)	≤0.030
Sulfur (S)	≤0.030
Silicon (Si)	0.50-1.00
Chromium (Cr)	1.00-1.50
Molybdenum (Mo)	0.44-0.65

Mechanical Properties of ASTM A234 WP11 Elbow
Property	Value
Tensile Strength, min (MPa)	415-585
Yield Strength, min (MPa)	205
Elongation, min (%)	20 (Longitudinal)
Hardness, max (HBW)	197

Chemical Composition of 1.25Cr-0.5Mo Alloys and Related Steel Grades (Weight Percentage)
Fe%	Cr%	Mo%	Mn%	Co%	V%	Cu%	Alloy Grades & Similar Specifications
97.84	1.11	0.49	0.34	0.11	0.06	0.006	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.81	1.13	0.48	0.37	0.09	0.08	0.05	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.87	1.07	0.50	0.42	0.006	0.14	-	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.71	1.14	0.52	0.41	0.16	0.006	0.007	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.78	1.10	0.49	0.37	0.14	0.08	0.005	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.75	1.11	0.51	0.38	0.004	0.14	0.006	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.72	1.11	0.50	0.40	0.17	0.06	0.04	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.77	1.10	0.50	0.34	0.18	0.06	0.05	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.85	1.06	0.51	0.41	0.14	0.02	0.130	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.87	1.08	0.52	0.36	0.005	0.14	0.005	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.61	1.20	0.49	0.46	0.014	0.14	0.09	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.59	1.20	0.48	0.44	0.10	0.04	0.149	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.70	1.17	0.49	0.40	0.20	0.04	0.157	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.66	1.20	0.52	0.45	0.005	0.04	0.149	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.60	1.30	0.49	0.010	0.42	0.004	0.11	1.25Cr-0.5Mo (ASTM A335 P11) P20 (Tool Steel, DIN 1.2311)
97.70	1.23	0.49	0.40	0.14	0.005	0.04	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)
97.69	1.13	0.53	0.45	0.19	-	0.157	1.25Cr-0.5Mo (ASTM A335 P11) C-0.5Mo (ASTM A335 P1)

Alloy Composition Analysis & Application Notes

• Alloy System Identification: The primary alloys listed are 1.25% chromium-0.5% molybdenum (1.25Cr-0.5Mo) steels, classified under ASTM A335 as Grade P11, with carbon content typically 0.10-0.20% (not explicitly shown). These are low-alloy steels designed for high-temperature service (up to 540°C).
• Key Element Roles: - Chromium (1.06-1.30%): Enhances oxidation resistance and forms chromium carbides for creep strength; - Molybdenum (0.48-0.53%): Strengthens the ferrite matrix and improves high-temperature creep resistance; - Trace Elements (V, Co, Cu): Present in minor amounts (<0.2%), with vanadium potentially contributing to carbide strengthening.
• Grade Equivalences: - 1.25Cr-0.5Mo (P11) corresponds to DIN 13CrMo4-5 and EN 10216-2 13CrMo4-5; - C-0.5Mo (P1) is equivalent to DIN 15Mo3 and EN 10216-2 16Mo3 (lower chromium, higher carbon).
• Industrial Applications: Suitable for high-temperature piping in power generation (boiler tubes, superheaters), petrochemical plants (hydrocracking units), and refineries, where resistance to creep and oxidation is critical.
• Variability Note: Composition ranges reflect manufacturing tolerances. The slight variations in element percentages (e.g., Cr 1.06-1.30%) remain within ASTM A335 specification limits, ensuring consistent mechanical properties.

Comparison of ASTM A234 WP11 Elbow with Other Fittings
Feature	ASTM A234 WP11 Elbow	ASTM A234 WPB Elbow	ASTM A403 WP304 Elbow
Material Type	Alloy Steel	Carbon Steel	Stainless Steel
Temperature Range	High (up to 620°C)	Moderate (-29°C to 425°C)	High (up to 870°C)
Corrosion Resistance	Good (Cr/Mo Content)	Moderate	Superior (Austenitic)
Erosion Resistance	Good	Good	Moderate
Creep Strength	Good	Moderate	Good
Applications	Boilers, Petrochemical, Refineries	General Piping, Boilers	Food Processing, Marine
Key Advantage	High-temp creep resistance	Cost-effective strength	Superior corrosion resistance

Key Benefits

Corrosion Resistance

High Cr/Mo content protects against oxidation and chemical degradation.

Erosion Resistance

Durable alloy steel withstands wear from abrasive slurries.

High-Temperature Strength

Excels in conditions up to 620°C with creep resistance.

Weldability

Supports welding for secure pipeline configurations.

Cost-Effective

Long lifespan reduces maintenance in high-temperature systems.

Versatile Configurations

Available in LR, SR, and reducing designs for diverse applications.

A234 WP22 Elbow Heat Treatment & Properties

Heat Treatment

Heated to high temperatures, then cooled under controlled conditions (not faster than still air) for improved toughness.

High Yield Strength

WP22 CL1 elbows offer superior yield strength compared to ordinary stainless steel fittings, ideal for critical applications.

Corrosion Resistance

Designed to withstand high temperature, pressure, and corrosive environments in refineries and power plants.

Applications

Commonly used in power generation, petroleum, and chemical plants for seamless, welded, threaded, or socket weld connections.

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A curated list of long-tail keywords for ASTM A234 WP11 elbows, covering specifications, applications, and material properties.

Standards and Specifications

• ASTM A234 WP11 elbow standards
• ASME B16.9 WP11 elbow specifications
• High-temperature WP11 elbow properties
• Industrial piping WP11 elbow standards

Applications

• ASTM A234 WP11 elbows for boiler pipeline protection
• WP11 elbows for petrochemical industry
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• High-temperature WP11 elbows for power plants
• Corrosion-resistant WP11 elbows for refineries

Material and Grades

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• Corrosion-resistant WP11 elbow grades
• High-temperature WP11 elbow properties

Manufacturing and Testing

• ASTM A234 WP11 elbow manufacturing process
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Procurement and Suppliers

• ASTM A234 WP11 elbow suppliers
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Dimensions and Customization

• ASTM A234 WP11 elbow dimensions
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Note: ASTM A234 WP11 covers alloy steel elbows for high-temperature and corrosion-resistant applications. Contact a certified supplier for detailed specifications.

Types of ASTM A234 WP11 Elbow Based on Connection with Pipe

Butt Welded Elbow

Formed by hot pressing or forging, directly welded to pipe with beveled ends for full penetration weld. Suitable for high pressure & high temperature pipelines.

Socket Welded Elbow

Features a socket at the end where the pipe is inserted before welding. The actual end diameter is slightly larger than pipe OD for proper fit.

Threaded Elbow

Similar to socket weld elbows but with threads inside for easy installation & removal. Ideal for repair and maintenance work in low/medium pressure pipelines.

Types of ASTM A234 WP11 Elbow Based on Material of Construction

Stainless Steel

ASTM A403 WP Gr. 304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904L

Carbon Steel

ASTM A234 WPB, WPBW, WPHY 42, 46, 52, 60, 65, 70

Low Temp Carbon Steel

ASTM A420 WPL3, A420 WPL6

Alloy Steel

ASTM / ASME A/SA 234 Gr. WP 1, 5, 9, 11, 12, 22, 91

Duplex Steel

ASTM A815 / ASME SA815, UNS S31803, S32205, Werkstoff No. 1.4462

Nickel Alloy

ASTM / ASME SB336: UNS 2200 (Nickel 200), 2201 (Nickel 201), 4400 (Monel 400), 8020 (Alloy 20), 8825 (Inconel 825), 6600 (Inconel 600), 6601 (Inconel 601), 6625 (Inconel 625), 10276 (Hastelloy C276)

What is the ASTM A234?

ASTM A234 specification details for chemical composition, tensile properties, and fitting designations for wrought carbon and alloy steel piping fittings.

The chemical composition of wrought carbon and alloy steel fittings under ASTM A234 must conform to the requirements listed in Table 1. All values are maximum unless otherwise indicated, and an ellipsis (...) indicates no requirement. The table includes grades such as WPB, WPC, WP1, WP11, WP12, WP22, WP5, WP9, WPR, WP91, and WP911, each with specific compositional limits for elements like carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, nickel, copper, and others like vanadium, columbium, nitrogen, aluminum, titanium, zirconium, boron, and tungsten.

Common grades are WP304/L, WP316/L. They can be used into many fields as engineering industry, energy conversion plants etc. ASTM A403 Standard specification covers the standard for wrought austenitic stainless steel fittings for pressure piping applications.

Chemical Requirements

The chemical composition of wrought carbon and alloy steel fittings under ASTM A234 must conform to the requirements listed in Table 1. All values are maximum unless otherwise indicated, and an ellipsis (...) indicates no requirement. The table includes grades such as WPB, WPC, WP1, WP11, WP12, WP22, WP5, WP9, WPR, WP91, and WP911, each with specific compositional limits for elements like carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, nickel, copper, and others like vanadium, columbium, nitrogen, aluminum, titanium, zirconium, boron, and tungsten.

Grade and Marking Symbol	Carbon	Manganese	Phosphorus, max	Sulfur, max	Silicon	Chromium	Molybdenum	Nickel	Copper	Others
WPB^B,C,D,E,F	0.30 max	0.29–1.06	0.050	0.058	0.10 min	0.40 max	0.15 max	0.40 max	0.40 max	Vanadium 0.08 max
WPC^C,D,E,F	0.35 max	0.29–1.06	0.050	0.058	0.10 min	0.40 max	0.15 max	0.40 max	0.40 max	Vanadium 0.08 max
WP1	0.28 max	0.30–0.90	0.045	0.045	0.10–0.50	...	0.44–0.65	...	...	...
WP12 CL1, CL2	0.05–0.20	0.30–0.80	0.045	0.045	0.60 max	0.80–1.25	0.44–0.65	...	...	...
WP11 CL1	0.05–0.15	0.30–0.60	0.030	0.030	0.50–1.00	1.00–1.50	0.44–0.65	...	...	...
WP11 CL2, CL3	0.05–0.20	0.30–0.80	0.040	0.040	0.50–1.00	1.00–1.50	0.44–0.65	...	...	...
WP22 CL1, CL3	0.05–0.15	0.30–0.60	0.040	0.040	0.50 max	1.90–2.60	0.87–1.13	...	...	...
WP5 CL1, CL3	0.15 max	0.30–0.60	0.040	0.030	0.50 max	4.0–6.0	0.44–0.65	...	...	...
WP9 CL1, CL3	0.15 max	0.30–0.60	0.030	0.030	1.00 max	8.0–10.0	0.90–1.10	...	...	...
WPR	0.20 max	0.40–1.06	0.045	0.050	...	...	1.60–2.24	0.75–1.25	...	...
WP91	0.08–0.12	0.30–0.60	0.020	0.010	0.20–0.50	8.0–9.5	0.85–1.05	0.40 max	...	Vanadium 0.18–0.25, Columbium 0.06–0.10, Nitrogen 0.03–0.07, Aluminum 0.02 max, Titanium 0.01 max, Zirconium 0.01 max
WP911	0.09–0.13	0.30–0.60	0.020	0.010	0.10–0.50	8.5–9.5	0.90–1.10	0.40 max	...	Vanadium 0.18–0.25, Columbium 0.060–0.10, Nitrogen 0.04–0.09, Aluminum 0.02 max, Boron 0.0003–0.006, Tungsten 0.90–1.10, Titanium 0.01 max, Zirconium 0.01 max

Notes:
A: Welded construction fittings are supplemented with “W”.
B: Fittings from bar/plate may have 0.35 max carbon.
C: Fittings from forgings may have 0.35 max carbon and 0.35 max silicon with no minimum.
D: For each 0.01% reduction below carbon max, manganese may increase by 0.06% up to 1.65%.
E: Sum of Copper, Nickel, Chromium, and Molybdenum shall not exceed 1.00%.
F: Sum of Chromium and Molybdenum shall not exceed 0.32%.
G: Applies to both heat and product analyses.

Tensile Requirements

The tensile properties of ASTM A234 fittings must meet the requirements in Table 2, specifying minimum tensile and yield strengths, and elongation for various grades. Testing can be longitudinal or transverse, with only the appropriate elongation requirement applying.

Grade and Marking Symbol	Tensile Strength, min ksi [MPa]	Yield Strength, min ksi [MPa]
WPB	60 [415]	35 [240]
WPC, WP11 CL2, WP12 CL2	70 [485]	40 [275]
WP1	55–80 [380–550]	30 [205]
WP11 CL1, WP22 CL1, WP5 CL1, WP9 CL1	60 [415]	30 [205]
WPR	63–88 [435–605]	46 [315]
WP11 CL3, WP22 CL3, WP5 CL3, WP9 CL3	75 [520]	45 [310]
WP91	90 [620]	60 [415]
WP911	90–120 [620–840]	64 [440]
WP12 CL1	60 [415]	32 [220]

Elongation Requirements

Grades	All Grades except WPR, WP91, WP911		WPR		WP91, WP911
	Longitudinal	Transverse	Longitudinal	Transverse	Longitudinal	Transverse
Standard round specimen, min % in 4D	22	14	20	...	20	13
Rectangular specimen, wall thickness ≥ 5/16 in. [7.94 mm], min % in 2 in. [50 mm]	30	20^A	28	...	...	...
Rectangular specimen, wall thickness < 5/16 in. [7.94 mm], min % in 2 in. [50 mm]	^B	^B	^B	...	...	...

Notes:
A: WPB and WPC fittings from plate shall have a minimum elongation of 17%.
B: For each 1/32 in. [0.79 mm] decrease in wall thickness below 5/16 in. [7.94 mm], deduct 1.5% (longitudinal) and 1.0% (transverse).

Wall Thickness, in. [mm]	All Grades except WPR, WP91, WP911		WPR	WP91, WP911
	Longitudinal	Transverse	Longitudinal	Longitudinal
5/16 (0.312) [7.94]	30.0	20.0	28.0	20
9/32 (0.281) [7.14]	28.5	19.0	26.5	19
1/4 (0.250) [6.35]	27.0	18.0	25.0	18
7/32 (0.219) [5.56]	25.5	...	23.5	17
3/16 (0.188) [4.76]	24.0	...	22.0	16
5/32 (0.156) [3.97]	22.5	...	20.5	15
1/8 (0.125) [3.17]	21.0	...	19.0	14
3/32 (0.094) [2.38]	19.5	...	17.5	13
1/16 (0.062) [1.59]	18.0	...	16.0	12

Elongation equations: Longitudinal: E = 48t + 15.00; Transverse: E = 32t + 10.00, where E = elongation in 2 in. or [50 mm], %, and t = thickness, in. [mm].

Fitting Designation for Marking Purposes

Fittings are marked per MSS-SP-25, indicating manufacturer, size, schedule/pressure class, fitting designation, and heat number. Welded fittings include a “W” suffix, and ultrasonic-inspected welds add a “U”.

Grade	Class	Construction	Mandatory Marking
WPB	-	Welded	WPBW^A
WPB	-	Seamless	WPB
WPC	-	Welded	WPCW^A
WPC	-	Seamless	WPC
WP1	-	Welded	WP1W^A
WP1	-	Seamless	WP1
WP12	CL1	Welded	WP12 CL1W^A
WP12	CL1	Seamless	WP12 CL1
WP12	CL2	Welded	WP12 CL2W^A
WP12	CL2	Seamless	WP12 CL2
WP11	CL1	Welded	WP11 CL1W^A
WP11	CL1	Seamless	WP11 CL1
WP11	CL2	Welded	WP11 CL2W^A
WP11	CL2	Seamless	WP11 CL2
WP11	CL3	Welded	WP11 CL3W^A
WP11	CL3	Seamless	WP11 CL3
WP22	CL1	Welded	WP22 CL1W^A
WP22	CL1	Seamless	WP22 CL1
WP22	CL3	Welded	WP22 CL3W^A
WP22	CL3	Seamless	WP22 CL3
WP5	CL1	Welded	WP5 CL1W^A
WP5	CL1	Seamless	WP5 CL1
WP5	CL3	Welded	WP5 CL3W^A
WP5	CL3	Seamless	WP5 CL3
WP9	CL1	Welded	WP9 CL1W^A
WP9	CL1	Seamless	WP9 CL1
WP9	CL3	Welded	WP9 CL3W^A
WP9	CL3	Seamless	WP9 CL3
WPR	-	Welded	WPRW^A
WPR	-	Seamless	WPR
WP91	-	Welded	WP91W^A
WP91	-	Seamless	WP91

Note: A: Add “U” to marking if welds are ultrasonic inspected in lieu of radiography.

Related products

ASTM A234 WP11 Elbow

ASTM A234 WP11 Elbow

ASTM A234 WP11 Elbow for High-Temperature Piping Solutions

What is A234 WP11 Fittings?

Alloy Composition Analysis & Application Notes

Key Benefits

Corrosion Resistance

Erosion Resistance

High-Temperature Strength

Weldability

Cost-Effective

Versatile Configurations

A234 WP22 Elbow Heat Treatment & Properties

Heat Treatment

High Yield Strength

Corrosion Resistance

Applications

You Can Also Search ASTM A234 WP11 Elbows by

Standards and Specifications

Applications

Material and Grades

Manufacturing and Testing

Procurement and Suppliers

Dimensions and Customization

What is an ASTM A234 WP11 Elbow?

How does ASTM A234 WP11 differ from ASTM A234 WPB?

What are the typical angles for ASTM A234 WP11 Elbows?

What is a reducing ASTM A234 WP11 elbow?

What materials are used in ASTM A234 WP11 Elbows?

How are ASTM A234 WP11 Elbows manufactured?

How is the quality of ASTM A234 WP11 Elbows ensured?

Why choose ASTM A234 WP11 Elbows for high-temperature systems?

What coatings are available for ASTM A234 WP11 Elbows?

How is the weight of an ASTM A234 WP11 Elbow calculated?

Types of ASTM A234 WP11 Elbow Based on Connection with Pipe

Butt Welded Elbow

Socket Welded Elbow

Threaded Elbow

Types of ASTM A234 WP11 Elbow Based on Material of Construction

Stainless Steel

Carbon Steel

Low Temp Carbon Steel

Alloy Steel

Duplex Steel

Nickel Alloy

What is the ASTM A234?

Chemical Requirements

Tensile Requirements

Elongation Requirements

Fitting Designation for Marking Purposes

ASTM A234 WP11 Elbow Applications

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ASTM A192 elbow

Long Radius Elbow

Short Radius Elbow

Reducing Elbow

ASTM A420 WPL6 Elbow

ASTM A234 WP22 Elbow