12X18h10t GOST17376 Tee,Gost Stainless steel pipe Tee SS321
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12X18H10T GOST 17376 Tee is a Russian standard stainless steel pipe fitting manufactured according to GOST 17376. The material 12X18H10T is equivalent to AISI 321 (SS321) stainless steel, offering excellent high-temperature strength and resistance to intergranular corrosion.
It is widely used in oil & gas pipelines, petrochemical plants, power generation systems, and high-temperature industrial piping.
What is 12X18H10T?
12X18H10T is a titanium-stabilized austenitic stainless steel grade under Russian GOST standards.
Equivalent grades:
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AISI 321
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UNS S32100
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EN 1.4541
The titanium addition improves resistance to intergranular corrosion after welding.
GOST 17376 Standard
GOST 17376 specifies technical requirements for seamless and welded butt-weld pipe fittings, including:
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Equal Tee
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Reducing Tee
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Stainless steel pipe tee
Manufacturing methods:
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Hot forming
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Cold forming
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Machined forging (if required)
Chemical Composition of 12X18H10T
| Element | Content (%) |
|---|---|
| C | ≤ 0.12 |
| Cr | 17.0 – 19.0 |
| Ni | 9.0 – 11.0 |
| Ti | ≥ 5×C |
| Mn | ≤ 2.0 |
Titanium stabilization enhances heat resistance and prevents carbide precipitation.
Mechanical Properties
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Tensile Strength: ≥ 520 MPa
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Yield Strength: ≥ 205 MPa
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Elongation: ≥ 40%
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Working temperature: up to 800°C
| Diameter of tees execution 1, D | 21.3-355.6 mm |
| Diameter of tees execution 2, D | 45-426 mm |
Steel transitional seamless tees (GOST 17376-2001). They are made from steel of the following grades: 20, 09G2S, 12X18H10T, 10X17H13M2T, 15X5M, 13XFA, 20A, 20C.
An example of a symbol for tees of steel gost 17376-2001:
• equal bore tee execution 2, D = 426 mm, T = 10 mm from steel 20 :
Tee 426×10-20 GOST 17376-01,
• the same from steel 09G2S for pipelines controlled by regulatory authorities:
Tee P 426×10-09G2S GOST 17376-01,
• adapter tee of execution 1, D = 355.6 mm, T = 11 mm, D1 = 219.1 mm, T1 = 8 mm from steel 20:
Tee 1-355.6×11-219.1×8-20 GOST 17376-01.
12X18H10T and AISI 321 Material comparison
| Standard | Steel Grade | ||||||||
| Chemical Composition % | |||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Ti: | N: | |
| EN | 1.4541 – X6CrNiTi18-10 | ||||||||
| <0.08 | <2.0 | <1.0 | <0.045 | <0.03 | 17.0 – 19.0 | 9.0 – 12.0 | <0.7 | – | |
| ASTM | AISI 321 – UNS S32100 | ||||||||
| <0.08 | <2.0 | <0.75 | <0.045 | <0.03 | 17.0 – 19.0 | 9.0 – 12.0 | <0.7 | <0.1 | |
| EN/DIN | 1.4878 – X8CrNiTi18-10 – X12CrNiTi18-9 | ||||||||
| <0.10 | <2.0 | <1.0 | <0.045 | <0.015 | 17.0 – 19.0 | 9.0 – 12.0 | <0.8 | – | |
| ASTM | AISI 321H – UNS S32109 | ||||||||
| 0.04 – 0.10 | <2.0 | <0.75 | <0.045 | <0.030 | 17.0 – 19.0 | 9.0 – 12.0 | 0.16 – 0.70 | – | |
| GOST | 08Ch18N10T – 08Х18Н10Т | ||||||||
| <0.08 | <2.0 | <0.8 | <0.035 | <0.020 | 17.0 – 19.0 | 9.0 – 11.0 | <0.7 | – | |
| GOST | 10Ch18N10T – 10Х18Н10Т | ||||||||
| <0.10 | 1.0 – 2.0 | <0.8 | <0.035 | <0.020 | 17.0 – 19.0 | 9.5 – 11.0 | <0.6 | – | |
| GOST | 12Ch18N10T – 12Х18Н10Т | ||||||||
| <0.12 | <2.0 | <0.8 | <0.035 | <0.020 | 17.0 – 19.0 | 9.0 – 11.0 | <0.8 | – | |
Testing & Inspection
To ensure product reliability and compliance with GOST standards, all 12X18H10T pipe tees undergo strict quality control procedures:
Raw Material Testing
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PMI (Positive Material Identification)
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Chemical composition analysis
Mechanical Testing
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Tensile strength test
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Hardness test
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Impact test (if required)
Non-Destructive Testing (NDT)
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Ultrasonic Testing (UT)
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Radiographic Testing (RT)
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Dye Penetrant Testing (PT)
Dimensional Inspection
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Wall thickness measurement
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End preparation check
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Visual inspection
Third-party inspection (SGS, BV, TUV) is available upon request.
Material Test Certificate (MTC) EN 10204 3.1 / 3.2 can be provided.
12X18H10T GOST 17376 Stainless Steel Tee (SS321 equivalent) is an ideal solution for high-temperature and corrosion-resistant piping systems. With excellent weldability, durability, and compliance with Russian standards, it is widely trusted in demanding industrial applications.
