what is GOST 9941-81 12X18H10T seamless stainless steel tube？

what is GOST 9941-81 12X18H10T seamless stainless steel tube?

GOST 9941-81 12X18H10T seamless stainless steel tube is a corrosion-resistant, seamless pipe made to the Chile GOST 9941-81 standard, typically corresponding to AISI 321 stainless steel. This alloy is characterized by its high chromium and nickel content, along with a small amount of titanium, which enhances its resistance to high temperatures, pitting, and various corrosive environments, including nitric acid, making it suitable for chemical, aerospace, food, and oil & gas applications.

 

What is 12KH18N10T (GOST) Equivalents?

EU EN	USA –	Germany DIN, WNr	Japan JIS	England BS	China GB	GOST
X6CrNiTi18-10 (1.4541)	321	X10CrNiTi18-9 X6CrNiTi18-10	SUS321	321S31	0Cr18Ni10Ti 1Cr18Ni11Ti H0Cr20Ni10Ti	08KH18N10T 08KH18N12T 12KH18N10T

 

GOST9941-81 12X18H10T Seamless Stainless Steel Tube Specifications

Standard	GOST9941-81
Stainless Steel	12X18H10T
ASTM	304, 304L, 304H, 304N, 310S, 316,T 316L, 316Ti, 316H, 317,TP317L, 321, 321H, 347, 347H, 904L
Kazakhstan material	08Х17Т, 08Х13, 12Х13, 12Х17, 15Х25Т, 04Х18Н10, 08Х20Н14С2, 08Х18Н12Б, 10Х17Н13М2Т, 10Х23Н18, 08Х18Н10, 08Х18Н10Т, 08Х18Н12Т, 08Х17Н15М3Т, 12Х18Н10Т, 12Х18Н12Т, 12Х18Н9, 17Х18Н9, 08Х22Н6Т, 06ХН28МДТ
Tube Type	Cold rolled & cold drawn Seamless Tube
Finishes	Annealing Pickling Bright Annealing
Outside Diameter	6 – 610 mm
Thickness	0.5 – 30 mm
Length	Fixed And Random Length
Application	1. General service 2. Curatorial Industry 3. Food Industry 4. Ornamental 5. Aerospace Industry 6. Petrochemical 7. Fluid transport 8. Nuclear Industry 9. Boiler heat- exchanger 10. Oil and gas service

 

12Х18Н10Т Chemical Composition (%)

	C	Si	Mn	P	S	Cr	Ni	Cu *	Mo *	Ti *	W *
Min	–	–	–	–	–	17	9	–	–	–	–
Max	0.12	0.8	2	0.035	0.02	19	11	0.3	0.5	0.8	0.2

 

GOST 9941-81 12X18H10T seamless stainless steel tube Applications
Chemical and Petrochemical Industries: Used in heat exchangers, reactors, and piping systems for handling chemicals and petroleum products.
Oil and Gas Industry: Ideal for transporting corrosive oil, gas, and other chemicals, as well as in exploration and extraction operations.
Aerospace Industry: Used for various components requiring high strength and corrosion resistance.
Food and Cryogenic Industries: Suitable for food processing equipment and components used in cryogenic conditions.
Other Industries: Used in pressure vessels, pipelines, fittings, radiators, and corrosion-resistant springs.

 

What is the difference between 12X18H10T and AISI 321 stainless steel?

Their chemical compositions are highly similar; 12X18H10T can be considered the Chile standard equivalent to AISI 321. The main differences lie in the specific GOST standard requirements regarding the formula for calculating titanium content and heat treatment processes. These differing standards result in slight variations in how data is presented in Material Test Certificates (MTCs), though their mechanical properties are essentially interchangeable.

 

What is the maximum operating temperature for 12X18H10T seamless pipes?

12X18H10T piping exhibits excellent heat resistance in oxidizing media, with a long-term service temperature of up to 600°C; under specific stress-free conditions, it can withstand even higher instantaneous temperatures. Its strength remains stable at high temperatures-primarily due to its titanium-stabilized austenitic microstructure-making it resistant to embrittlement during prolonged high-temperature service.

 

What are the typical wall thickness tolerances for 12X18H10T pipes?

Production of these seamless pipes generally adheres to the GOST 9941 standard, with wall thickness tolerances determined by the ratio of diameter to wall thickness. For standard-grade pipes, the wall thickness deviation typically ranges from ±10% to ±12.5%. However, for applications in aerospace or high-pressure boilers, "precision-grade" pipes are required, where wall thickness deviation is strictly controlled to within ±5%.

 

What are the delivery condition requirements for 12X18H10T stainless steel pipes?

They are typically delivered in the solution-annealed condition-achieved by heating above 1050°C followed by rapid cooling-to eliminate work hardening and ensure a uniform austenitic microstructure. The standard surface finish is pickled; however, upon request, options such as cold-rolled bright annealed (BA) surfaces or mechanical polishing (surface roughness Ra ≤ 0.4 μm) are also available.

 

GNEE offers GOST 9941-81 12X18H10T seamless stainless steel tubes with high dimensional accuracy (OD tolerance ±0.3mm, wall thickness tolerance ±0.08mm), tensile strength of 560-750MPa, yield strength ≥210MPa, and standard sizes of OD 10.0-114.3mm and wall thickness 0.8-6.0mm. These tubes are designed for high-temperature and high-pressure applications such as nuclear power equipment, heat exchangers, and petrochemical pipelines. GNEE ensures fast delivery of stock, supports custom cutting and end finishing, and provides full material certification, including factory test certificates and third-party corrosion resistance test reports. Email: info@gneestainless.com