GOST 9941 08X18H10T Seamless Cold drawn pipe

What is GOST 9941-2022?

GOST 9941 is a Russian standard that supersedes the previous GOST 9941-81. It specifies the technical requirements for seamless cold-worked and hot-worked pipes made of corrosion-resistant high-alloy steel (stainless steel). These pipes are primarily used in industrial environments characterized by high temperatures, high pressures, and highly corrosive conditions, such as the oil and gas, chemical, and power generation sectors.

 

GOST 9941 08X18H10T Pipe Manufacturer

GOST 9941 08X18H10T cold-drawn pipes are equivalent to AISI 321 or EN 1.4541. They feature strictly controlled chemical composition-carbon ≤0.08%, chromium 17.0%–19.0%, and nickel 9.0%–11.0%-with a titanium addition of 5×C% to 0.8%. This composition eliminates the risk of intergranular corrosion during welding and high-temperature operation, ensuring excellent chemical stability within the 400°C–800°C sensitization range; they are ideal for long-term high-temperature service in boilers, heat exchangers, and high-temperature chemical piping.

 

GOST 9941 08X18H10T stainless steel seamless pipes undergo a solution annealing process at 1050°C–1100°C, stabilizing the hardness below 179 HB and minimizing the risk of cracking during subsequent bending, flaring, or pressure impact. With a surface roughness (Ra) better than 0.8 μm, these pipes offer an 11% increase in heat transfer efficiency, significantly improving fluid transport performance and reducing fouling and coking rates.

 

GNEE supplies GOST 9941 08X18H10T cold-drawn seamless pipes with outer diameters ranging from 6 mm to 426 mm, wall thicknesses from 0.5 mm to 30 mm, and lengths up to 12 meters; custom sizes are also available. Each pipe is manufactured from certified raw materials and undergoes rigorous testing-including 100% PMI (Positive Material Identification), Ultrasonic Testing (UT), Eddy Current Testing (ET), hydrostatic testing, dimensional inspection, surface quality checks, and chemical composition analysis-to ensure compliance with GOST and international quality standards. EN 10204 3.1 material certificates and third-party inspection services (SGS, BV, or TUV) can be provided upon customer request.

What is the maximum operating temperature of 08X18H10T?

In an oxidizing atmosphere, the maximum safe continuous service temperature for this material is 800°C–850°C. However, for pressure-bearing heated surfaces, operation below 600°C is generally recommended to ensure long-term creep strength.

 

What is the difference between 08X18H10T and 12X18H10T?

The primary difference between 08X18H10T and 12X18H10T is their carbon content. Both are Russian (GOST) titanium-stabilized austenitic stainless steels (similar to global AISI 321 standards), but 08X18H10T is a low-carbon variant.

Chemical Composition of 12X18H10T 08X18H10T AISI 321 Stainless Steel Seamless Tube Pipe

Chemical Composition (%)
Grade		C	Mn	P	S	Si	Cr	Ni	N	Ti	Cu
AISI 321	min	-	-	-	-	-	17,0	9,0	-	5x(C+N)	-
	max	0,080	2,00	0,045	0,030	1,00	19,0	12,0	0,10	0,70
AISI 321H	min	0,040	-	-	-	-	17,0	9,0	-	4x(C+N)	-
	max	0,100	2,00	0,045	0,030	1,00	19,0	12,0	0,10	0,70	-
08X18H10T	min	-	-	-	-	-	17,0	9,0	-	5xC	-
	max	0,080	2,00	0,035	0,020	0,80	19,0	11,0	-	0,70	0,30
12X18H10T	min	-	-	-	-	-	17,00	9,00	-	5xC	-
	max	0,120	2,00	0,035	0,020	0,80	19,00	11,00	-	0,80	0,30

 

Mechanical Performance of 12X18H10T 08X18H10T AISI 321 Stainless Steel Seamless Tube Pipe

Mechanical Performance
Grade	Mpa (kgf/mm²)		Elongation .(%) in 2" (min.)	Hardness
	Tensile strength (min.)	Yield strength (min.)		HRB(max.)
AISI 321	515	205	35	90
AISI 321H	515	205	35	90
08X18H10T	549	216	37	-
12X18H10T	549	216	35	-

 

Standards and Tolerance for Stainless Steel Seamless Tube Pipe

Standard	Outside Diameter Tolerance(mm)		Thickness Tolerance		Length Tolerance (mm)
GOST 9941-2022	D<10	Normal:±0.30	T<0.3	Normal:±0.05 mm	+15/-0
				High:±0.03 mm
		High:±0.20	(0.3~0.4]	Normal:±0.07 mm
				High:±0.05 mm
		Higher:±0.15	(0.4~0.6]	Normal:±0.10 mm
				High:±0.07 mm
	(10~30]	Normal:±0.40	(0.6~1.0]	Normal:±0.15 mm
				High:±0.10 mm
		High:±0.30	(1~3] D/S <40	Normal:+12.5%/-15%
				High:±12.5%
		Higher:±0.20		Higher:+12.5%/-10%
			(1~3] D/S >40	Higher:±15%
	(30~95]	Normal:±1.2%		Normal:+12.5%/-15%
		High:±1%	(3~7] D/S <40	Normal:±12.5%
		Higher:±0.8%		High:+12.5%/-10%
	D>95 D/S <40	Normal:±1.2%		Higher:±10%
		High:±1%	(3~7] D/S >40	Normal:+12.5%/-15%
		Higher:±0.8%		High:±12.5%
	D>95 D/S >40	Normal:±1.5%	T>7 D<325	Normal:+12.5%/-10%
		High:±1.2%		High:±10%
		Higher:±1.0%	T>7 D>325	Normal:+12.5%/-15%

 

08X18H10T Stainless Steel Tube Applications

Petrochemicals: Manufacturing heat-resistant and corrosion-resistant heat exchanger piping and pressure vessels.
Energy and Nuclear Power: Used for superheater tubes, boiler piping, and nuclear power plant cooling systems.
Aerospace: Exhaust systems, manifolds, and fuel systems.
Russia/CIS Projects: Supporting oil and gas pipeline infrastructure and refinery upgrades in Central Asia, Russia, and other regions.

Quality Control

To comply with the GOST 9941 standard, the pipes must undergo the following tests:
Chemical composition analysis: Specifically, the proportions of carbon (C) and titanium (Ti).
Intergranular corrosion (IGC) test: Typically conducted in accordance with the GOST 6032 standard; this is a critical quality indicator.
Tensile and hardness tests: To ensure tensile strength and elongation meet the required standards.
Flattening and flaring tests: To assess the pipe's ductility and the reliability of welded areas (where applicable).
Non-destructive testing: 100% ultrasonic testing (UT) or eddy current testing (ET).

 

Packaging

Plastic End Caps: Plastic caps (typically blue, red, or yellow) are fitted to both ends of each steel pipe.
Steel Strapping: High-strength steel straps are used for bundling, with at least 3–5 binding points per bundle. Protective materials-such as cardboard, nylon pads, or rubber strips-are placed between the straps and the pipes to prevent the straps from damaging the pipe surface.
Wooden Case Packaging (Recommended): For 08X18H10T pipes with thin walls (WT < 2mm) or high-precision requirements, fumigated wooden cases (compliant with IPPC standards) or steel-framed wooden crates are typically used. This is the best method to prevent deformation due to crushing or breakage.
Woven Bag Packaging: For standard specifications, the entire pipe body can be wrapped in thickened, double-layer woven bags (featuring an inner waterproof film and an outer abrasion-resistant layer).