Inconel C276 N10276 2.4819 Corrosion Resistance Alloy CRA Plates and Sheets

Model: Inconel C276 N10276 2.4819

Review

Description

Inconel C276 N10276 2.4819 Corrosion Resistance Alloy CRA Pipe

C276 (UNS N10276) is a cold hardened nickel-based alloy intended for the most extreme well conditions up to 450°F.

In addition to its exceptional corrosion resistance under the most severe conditions, higher strengths may be achieved with C276 than other nickel alloys. It is therefore used for downhole tubular components, packers, and other subsurface equipment under the most extreme environmental conditions found in high-pressure, high-temperature (HPHT) wells, saltwater Injection wells, and Acid Gas Injection (AGI) wells. However, all environmental factors, including H2S, CO2 , temperature, pH, and chloride concentration, should be considered before final material selection.

The alloy is classified in MR0175/ISO15156 as a type 4e alloy, with no restrictions to a partial pressure of H2S below 400°F and resistant to 1000 psi H2S at 450°F.

Hastelloy C276 alloy (UNS N10276) was the first wrought, nickel-chromium- molybdenum material to alleviate concerns over welding (by virtue of extremely low carbon and silicon contents). As such, it was widely accepted in the chemical process and associated industries,

ALSO KNOWN AS

• C-276
• SMC276®
• INCONEL® Alloy C-276
• Hastelloy® C-276
• W.Nr. 2.4819

Applications

Typical chemical process industry (CPI) applications include reactors, heat exchangers, and columns, marine hardware, Chemical processing components Agrichemical and petrochemical production.

CHEMICAL COMPOSITION

C	Cr	Ni	Fe	Mn	Si	Mo	Co	P	S	V	W
≤ 0.02	14.5 - 16.5	BAL	4 - 7	≤ 1	≤ 0.08	15 - 17	≤ 2.5	≤ 0.03	≤ 0.03	≤ 0.35	3 - 4.5

MANUFACTURING PROCESS

PROCESS	DESCRIPTION
Steel Making	Made by electric furnace process or blast furnace followed by Vacuum Oxygen Decarburization (VOD) process or Argon Oxygen Decarburization (AOD) Process
Pipe Making	Manufactured by traditional tube manufacturing processes, High strength tubulars should be furnished in cold worked condition
Heat Treatment	Solution Annealing Process before final cold drawing

API 5CRA / ISO 13680 Group 2 Category 15-60-16

Grade	Yield Strength ksi		Tensile Strength ksi	Elongation %	Hardness HRC	NACE MR0175/ISO 15156 H2S Sour Service Limits
Grade	min	max	min	min	max	NACE MR0175/ISO 15156 H2S Sour Service Limits
110	110	140	125	11	35	Table A.14	No limit ≤ 400°F, Refer to table for temperatures up to 450°F
125	125	150	130	10	37	Table A.14
140	140	160	145	9	38	140 Grade not recommended for sour service
*Non-standard mechanical properties and grades are made available upon agreement.

TYPICAL PHYSICAL PROPERTIES

		70°F	200°F	400°F
Density	lbs/in3	0.32
Thermal Expansion	X10-6/°F	6	6.2	6.7
Elastic Modulus	psi x 106	29.8	29	28.3
Poisson Ratio		0.3
Thermal Conductivity	Btu/ft h °F	5.9	6.4	7.5
Specific Heat	Btu/lb °F	0.1	0.1	0.1

Specification

HASTELLOY C-276	ASTM	ASME	DIN
Plate sheet and Strip	B575 / B906	SB575 / SB906	17750
Seamless, Pipe and Tubing	B622 / B829	SB622 / SB829	17751
Welded Pipe and Tubing	B626 / B751 B619 / B775	SB626 / SB751 SB619 / SB775	17751
Rod, Bar and Forgings	B462 / B564 / B574	SB564 / SB574	17752 / 17753 / 17754

Impact Strength

Type of Test	Test Temperature	Form	Thickness		Impact Strength
Type of Test	Test Temperature	Form	in	mm	ft.lbf	J
Charpy V-Notch	RT	Plate	0.394	10	348	472
Charpy V-Notch	RT	Plate	0.472	12	351	476

Hardness

Form	Hardness, HRBW	Typical ASTM Grain Size
Sheet	88	3.5 - 6
Plate	88	1 - 5
Bar	86	1 - 5

Welding and Fabrication

HASTELLOY C-276 alloy is very amenable to the Gas Metal Arc GMA/MIG), Gas Tungsten Arc (GTA/TIG), and Shielded Metal Arc (SMA/Stick) welding processes. Matching filler metals (i.e. solid wires and coated electrodes) are available for these processes, and welding guidelines are given in the “Welding and Fabrication” brochure.

HASTELLOY C-276 alloy can be hot forged, hot rolled, hot upset, hot extruded, and hot formed. However, it is more sensitive to strain and strain rates than the austenitic stainless steels, and the hot working temperature range is quite narrow. While cold work does not usually affect the resistance of HASTELLOY® C-276 alloy to general corrosion, and to chloride-induced pitting and crevice attack, it can affect resistance to stress corrosion cracking. For optimum corrosion performance, therefore, the re-annealing of cold worked parts (following an outer fiber elongation of 7% or more) is important.