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GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation

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Mr. Richard SHEN

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GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation

Adedi:	1 ton
fiyat:	800-1000 USD/Tons
Standart ambalaj:	Demetler halinde veya ahşap kutularda.
Teslim süresi:	Ürünlerde 20-30 gün
Ödeme yöntemi:	L/C, D/A, D/P, T/T, Western Union, MoneyGram
Tedarik kapasitesi:	60000 Ton/Ton/Yıl

Ayrıntılar Bilgi

Ürün Tanımı

Ayrıntılı Bilgiler

Menşe yeri

Zhejiang/Çin

Marka adı

TORICH

Sertifika

ISO9001, ISO14001, TS16949

Model numarası

GOST 550-75

Malzeme:

Karbon çeliği ve alaşımlı çelik; alaşım kaliteleri yaygın olarak

Standart:

GOST 550-75

Seviye:

20, 12МХ, 12Х8, 1Х2М1, 15Х5ВФ

Dış Çap:

19–219 mm

Duvar kalınlığı:

1,5–25,0 mm

Uzunluk:

Tablo 1'e göre Grup A sabit uzunluklar, tipik olarak 4,0–12,2 m; özel 1–12 m anlaşmayla mümkündü

Yüzey durumu:

Kıvrım, çatlak, katlanma, kabuklanma ve kılcal çizgilerden arınmış; Minimum duvar toleransı dahilind

Isıl İşlem:

Tüpler ısıl işlem görmüş durumda sağlanır; 10, 20 ve 10Г2 sıcak işlenmiş çelik borular haddeleme ısı

Ürün Tanımı

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 0

GOST 550-75 Alloy Seamless Steel Tubes for Petroleum Processing and Petrochemical Service

Although this product is often marketed as “for oil transportation,” GOST 550-75 is technically a seamless steel tube specification for petroleum processing and petrochemical industry equipment and piping, rather than a long-distance transmission line pipe standard. Under GOST 550-75, tubes are supplied in Group A and Group B, with Group A covering fixed-length tubes and tighter dimensional requirements, while the standard itself was later superseded by GOST 550-2020 in current interstate standardization.

GOST 550-75 seamless tubes are intended for refinery and petrochemical duty where buyers care about elevated-temperature strength, controlled chemistry, dimensional reliability, hydrostatic integrity, and traceable heat-treatment condition. The standard covers both carbon and alloy grades, including Cr-Mo and Cr-W-V heat-resistant steels used in demanding process piping and equipment circuits.

Specifications

Item	Specification
Material	Carbon steel and alloy steel; alloy grades commonly include 12МХ, 12Х8, 1Х2М1, 15Х5М, 15Х5ВФ
Standard	GOST 550-75
Steel grade examples	20, 12МХ, 12Х8, 1Х2М1, 15Х5ВФ
Outside diameter	19–219 mm
Wall thickness	1.5–25.0 mm
Length	Group A fixed lengths according to Table 1, typically 4.0–12.2 m; custom 1–12 m is feasible by agreement
Tolerance range	Group A: cold/warm tubes of steels 10 and 20 to GOST 9567; OD up to 30 mm: ±0.2 mm, above 30 mm: ±0.3 mm; hot-finished OD: +0.5% / -1.25%; cold/warm WT: ±8%; hot-finished WT ≤15 mm: ±12.5%, WT >15 mm: ±10%
Straightness	Group A local bow not over 1.5 mm per 1 m; total bow not over 8 mm
Length tolerance	+10 mm for tubes up to 6 m; +15 mm for tubes over 6 m or OD above 152 mm
Surface condition	Free from folds, cracks, laps, shelling and hairlines; local dressing permitted within minimum wall tolerance
Heat treatment	Tubes are supplied in heat-treated condition; hot-finished tubes of steels 10, 20 and 10Г2 may be supplied from rolling heat
Testing	Hydraulic test to GOST 3845, pressure up to 30 MPa, holding time not less than 10 s; NDT may be agreed as an alternative to hydrotest

Main Features

Refinery-grade alloy seamless construction: no weld seam, reducing the weld-zone risk in elevated-temperature hydrocarbon service. GOST 550-75 specifically targets refinery and petrochemical equipment and piping.
Controlled size envelope: OD 19–219 mm and WT 1.5–25.0 mm, suitable for small and medium process lines, heater circuits, and plant equipment connections.
Tight Group A dimensional control: cold/warm tubes of steels 10 and 20 can be supplied at ±0.2 mm OD up to 30 mm and ±0.3 mm above 30 mm, with ±8% wall tolerance for cold/warm tubes.
Straightness control for fabrication: ≤1.5 mm/m local curvature and ≤8 mm total curvature for Group A supports easier fit-up during spool fabrication.
Mandatory heat-treated delivery condition: the standard requires heat-treated supply, with only limited exceptions for hot-finished 10, 20, and 10Г2 from rolling heat.
Pressure integrity verification: hydraulic testing is required up to 30 MPa, with a minimum 10-second hold, and NDT can be specified as an equivalent integrity route.
Process-grade Cr-Mo and Cr-W-V options: grades such as 12МХ, 1Х2М1, 15Х5М, and 15Х5ВФ support higher-temperature refinery service than plain carbon grades.

Our Advantages

1. “Can you actually hold refinery-critical dimensions, or only nominal mill tolerances?”
A professional buyer usually checks OD, wall, straightness, and fixed-length tolerances before approving a refinery tube source. GOST 550-75 already defines measurable controls for Group A, including ±0.2 / ±0.3 mm OD, ±8% wall tolerance for cold/warm tubes, ≤1.5 mm/m straightness, and +10 / +15 mm length tolerance. This means supply can be aligned to fabrication-shop expectations rather than vague “commercial tolerance” language.

2. “How do I reduce the risk of tube rejection after arrival at site?”
Experienced buyers focus on surface quality, hydrotest/NDT, and batch traceability. GOST 550-75 requires tubes to be free of folds, cracks, laps and similar defects, mandates hydraulic testing, and defines lot acceptance rules by size, heat-treatment regime, and in several alloy grades even by heat. That structure materially improves inspection traceability during incoming QA.

3. “Is the offered grade really suitable for elevated-temperature refinery duty?”
This is the core technical question. GOST 550-75 includes not only carbon steels but also Cr-Mo and Cr-W-V heat-resistant grades such as 12МХ, 1Х2М1, 15Х5М, and 15Х5ВФ, and it sets minimum tensile, yield, elongation, impact, and hardness values by grade and supply condition. In practice, that allows the buyer to specify a grade around service temperature and process severity instead of buying a generic seamless tube and hoping it performs.

Execution Standards

System	Brief reference
GOST	GOST 550-75 for seamless tubes for petroleum processing and petrochemical industry; current successor is GOST 550-2020
ASTM	Closest elevated-temperature alloy reference: ASTM A335/A335M for seamless ferritic alloy-steel pipe for high-temperature service
EN	Closest pressure-tube reference: EN 10216-2 for seamless non-alloy and alloy steel tubes with specified elevated-temperature properties
JIS	Closest alloy high-temperature pipe reference: JIS G 3458 for alloy steel pipes
GB	Closest Chinese petrochemical reference: GB/T 9948-2025 for seamless steel tubes and pipes for petrochemical and chemical facilities

Application Field

Specific application: seamless alloy tube for crude distillation unit heater outlet piping spools in refinery service, where elevated temperature, pressure tightness, and stable dimensional control are more important than generic fluid-transport pipe pricing. This application fits the refinery and petrochemical process scope of GOST 550-75 much better than cross-country pipeline service.

Chemical Composition

Grade	Standard source	C	Si	Mn	Cr	Mo	W	V	Ni	P	S
20	GOST 1050	0.17–0.24	0.17–0.37	0.35–0.65	≤0.25	—	—	—	≤0.30	≤0.035	≤0.040
12МХ	GOST 20072	0.09–0.16	0.17–0.37	0.40–0.70	0.40–0.70	0.40–0.60	—	—	≤0.30	≤0.030	≤0.025
12Х8	GOST 550-75 / GOST 20072 family	≤0.12	0.17–0.37	0.30–0.60	7.5–9.0	—	—	—	≤0.40	≤0.035	≤0.030
1Х2М1	GOST 550-75	0.08–0.13	0.17–0.37	0.30–0.60	2.0–2.5	0.9–1.1	—	—	≤0.50	≤0.035	≤0.035
15Х5ВФ	GOST 20072	≤0.15	0.30–0.60	≤0.50	4.5–6.0	—	0.4–0.7	0.4–0.6	≤0.60	≤0.030	≤0.025

Mechanical Properties

Grade	Supply condition in GOST 550-75	Tensile strength, MPa	Yield strength, MPa	Elongation, %	Reduction of area, %	Impact toughness KCU, J/cm²	Hardness, HB max
20	Hot-finished	≥431	≥255	≥22	≥50	≥78	≤156
12МХ	Hot-finished	≥412	≥245	≥21	≥45	≥69	≤156
12Х8	Cold- or warm-deformed	≥392	≥216	≥22	—	—	≤170
1Х2М1	Hot-finished	≥441	≥265	≥20	≥45	≥98	≤227
15Х5ВФ	Hot-finished	≥392	≥216	≥22	≥50	≥118	≤170

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 1

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 2

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 4

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 6

TORICH Group, an one-stop service provider of raw materials engaged in raw material production, R&D and

trade, has 30+ years of experience in the market, exported to 56 +countries, and won good reputation and

credibility among domestic and foreign customers.

The company's production plant covers an area of over 10,000 square meters, with an annual production

capacity of 50,000 tons of materials and a comprehensive trading and warehousing capacity of 100,000 tons, which can satisfy customers' personalized needs for raw materials in terms of diversity and timeliness.

The group holds shares in more than ten domestic production entities, whose main products include

seamless steel pipes ( carbon steel and stainless steel), welded pipes ( carbon steel and stainless steel), pipe fittings ( carbon steel and stainless steel), titanium (titanium tubes, titanium rods, titanium cakes, titanium plates, etc.), aluminum (aluminum tubes, aluminum rods, aluminum die casting, aluminum casting, CNC machining), and CNC deep processing of metal materials such as tubes, rods, and casting parts.

Over the past 30 years, the company has been gradually developing new technologies and materials to meet

the growing needs of customers and various diversified needs, exporting to more than 56 countries and still

increasing the number of exporting countries, aiming to help customers to solve the demand for raw materials, and to facilitate one-stop purchasing for customers.

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.

Etiketler:

soğuk çekilmiş dikişsiz boru,

hassas dikişsiz boru,

siyah karbonlu çelik boru

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GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation

Adedi:	1 ton
fiyat:	800-1000 USD/Tons
Standart ambalaj:	Demetler halinde veya ahşap kutularda.
Teslim süresi:	Ürünlerde 20-30 gün
Ödeme yöntemi:	L/C, D/A, D/P, T/T, Western Union, MoneyGram
Tedarik kapasitesi:	60000 Ton/Ton/Yıl

Ayrıntılı Bilgiler

Ürün Tanımı

Ayrıntılı Bilgiler

Menşe yeri

Zhejiang/Çin

Marka adı

TORICH

Sertifika

ISO9001, ISO14001, TS16949

Model numarası

GOST 550-75

Malzeme:

Karbon çeliği ve alaşımlı çelik; alaşım kaliteleri yaygın olarak

Standart:

GOST 550-75

Seviye:

20, 12МХ, 12Х8, 1Х2М1, 15Х5ВФ

Dış Çap:

19–219 mm

Duvar kalınlığı:

1,5–25,0 mm

Uzunluk:

Tablo 1'e göre Grup A sabit uzunluklar, tipik olarak 4,0–12,2 m; özel 1–12 m anlaşmayla mümkündü

Yüzey durumu:

Kıvrım, çatlak, katlanma, kabuklanma ve kılcal çizgilerden arınmış; Minimum duvar toleransı dahilind

Isıl İşlem:

Tüpler ısıl işlem görmüş durumda sağlanır; 10, 20 ve 10Г2 sıcak işlenmiş çelik borular haddeleme ısı

Min sipariş miktarı:

1 ton

Fiyat:

800-1000 USD/Tons

Ambalaj bilgileri:

Demetler halinde veya ahşap kutularda.

Teslim süresi:

Ürünlerde 20-30 gün

Ödeme koşulları:

L/C, D/A, D/P, T/T, Western Union, MoneyGram

Yetenek temini:

60000 Ton/Ton/Yıl

Ürün Tanımı

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 0

GOST 550-75 Alloy Seamless Steel Tubes for Petroleum Processing and Petrochemical Service

Specifications

Item	Specification
Material	Carbon steel and alloy steel; alloy grades commonly include 12МХ, 12Х8, 1Х2М1, 15Х5М, 15Х5ВФ
Standard	GOST 550-75
Steel grade examples	20, 12МХ, 12Х8, 1Х2М1, 15Х5ВФ
Outside diameter	19–219 mm
Wall thickness	1.5–25.0 mm
Length	Group A fixed lengths according to Table 1, typically 4.0–12.2 m; custom 1–12 m is feasible by agreement
Tolerance range	Group A: cold/warm tubes of steels 10 and 20 to GOST 9567; OD up to 30 mm: ±0.2 mm, above 30 mm: ±0.3 mm; hot-finished OD: +0.5% / -1.25%; cold/warm WT: ±8%; hot-finished WT ≤15 mm: ±12.5%, WT >15 mm: ±10%
Straightness	Group A local bow not over 1.5 mm per 1 m; total bow not over 8 mm
Length tolerance	+10 mm for tubes up to 6 m; +15 mm for tubes over 6 m or OD above 152 mm
Surface condition	Free from folds, cracks, laps, shelling and hairlines; local dressing permitted within minimum wall tolerance
Heat treatment	Tubes are supplied in heat-treated condition; hot-finished tubes of steels 10, 20 and 10Г2 may be supplied from rolling heat
Testing	Hydraulic test to GOST 3845, pressure up to 30 MPa, holding time not less than 10 s; NDT may be agreed as an alternative to hydrotest

Main Features

Refinery-grade alloy seamless construction: no weld seam, reducing the weld-zone risk in elevated-temperature hydrocarbon service. GOST 550-75 specifically targets refinery and petrochemical equipment and piping.
Controlled size envelope: OD 19–219 mm and WT 1.5–25.0 mm, suitable for small and medium process lines, heater circuits, and plant equipment connections.
Tight Group A dimensional control: cold/warm tubes of steels 10 and 20 can be supplied at ±0.2 mm OD up to 30 mm and ±0.3 mm above 30 mm, with ±8% wall tolerance for cold/warm tubes.
Straightness control for fabrication: ≤1.5 mm/m local curvature and ≤8 mm total curvature for Group A supports easier fit-up during spool fabrication.
Mandatory heat-treated delivery condition: the standard requires heat-treated supply, with only limited exceptions for hot-finished 10, 20, and 10Г2 from rolling heat.
Pressure integrity verification: hydraulic testing is required up to 30 MPa, with a minimum 10-second hold, and NDT can be specified as an equivalent integrity route.
Process-grade Cr-Mo and Cr-W-V options: grades such as 12МХ, 1Х2М1, 15Х5М, and 15Х5ВФ support higher-temperature refinery service than plain carbon grades.

Our Advantages

Execution Standards

System	Brief reference
GOST	GOST 550-75 for seamless tubes for petroleum processing and petrochemical industry; current successor is GOST 550-2020
ASTM	Closest elevated-temperature alloy reference: ASTM A335/A335M for seamless ferritic alloy-steel pipe for high-temperature service
EN	Closest pressure-tube reference: EN 10216-2 for seamless non-alloy and alloy steel tubes with specified elevated-temperature properties
JIS	Closest alloy high-temperature pipe reference: JIS G 3458 for alloy steel pipes
GB	Closest Chinese petrochemical reference: GB/T 9948-2025 for seamless steel tubes and pipes for petrochemical and chemical facilities

Application Field

Chemical Composition

Grade	Standard source	C	Si	Mn	Cr	Mo	W	V	Ni	P	S
20	GOST 1050	0.17–0.24	0.17–0.37	0.35–0.65	≤0.25	—	—	—	≤0.30	≤0.035	≤0.040
12МХ	GOST 20072	0.09–0.16	0.17–0.37	0.40–0.70	0.40–0.70	0.40–0.60	—	—	≤0.30	≤0.030	≤0.025
12Х8	GOST 550-75 / GOST 20072 family	≤0.12	0.17–0.37	0.30–0.60	7.5–9.0	—	—	—	≤0.40	≤0.035	≤0.030
1Х2М1	GOST 550-75	0.08–0.13	0.17–0.37	0.30–0.60	2.0–2.5	0.9–1.1	—	—	≤0.50	≤0.035	≤0.035
15Х5ВФ	GOST 20072	≤0.15	0.30–0.60	≤0.50	4.5–6.0	—	0.4–0.7	0.4–0.6	≤0.60	≤0.030	≤0.025

Mechanical Properties

Grade	Supply condition in GOST 550-75	Tensile strength, MPa	Yield strength, MPa	Elongation, %	Reduction of area, %	Impact toughness KCU, J/cm²	Hardness, HB max
20	Hot-finished	≥431	≥255	≥22	≥50	≥78	≤156
12МХ	Hot-finished	≥412	≥245	≥21	≥45	≥69	≤156
12Х8	Cold- or warm-deformed	≥392	≥216	≥22	—	—	≤170
1Х2М1	Hot-finished	≥441	≥265	≥20	≥45	≥98	≤227
15Х5ВФ	Hot-finished	≥392	≥216	≥22	≥50	≥118	≤170

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 1

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 2

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 4

GOST 550-75 Alloy Seamless Steel Tubes For Oil transportation 6

TORICH Group, an one-stop service provider of raw materials engaged in raw material production, R&D and

trade, has 30+ years of experience in the market, exported to 56 +countries, and won good reputation and

credibility among domestic and foreign customers.

The company's production plant covers an area of over 10,000 square meters, with an annual production

The group holds shares in more than ten domestic production entities, whose main products include

Over the past 30 years, the company has been gradually developing new technologies and materials to meet

the growing needs of customers and various diversified needs, exporting to more than 56 countries and still

increasing the number of exporting countries, aiming to help customers to solve the demand for raw materials, and to facilitate one-stop purchasing for customers.

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.

Etiketler: