GOST 8733-74 Cold-Formed and Warm-Formed Seamless Steel Pipes

GOST 8733-74 specifies the technical requirements for cold-formed and warm-formed seamless steel pipes manufactured from carbon and alloy steels for general-purpose applications. These pipes are produced without a longitudinal weld seam and are available in a range of outside diameters, wall thicknesses, steel grades, and delivery conditions. Dimensional requirements are referenced to GOST 8734 and GOST 9567, depending on the product type. The standard defines inspection and acceptance requirements according to the specified quality group, including chemical composition, mechanical properties, heat treatment, and hydraulic testing where applicable.

Specifications

Note: GOST 8733-74 defines technical requirements, while dimensional tolerances depend on the referenced dimensional standard and product specification. Exact dimensions, tolerances, and delivery conditions should be confirmed before ordering.

Main Characteristics

• Seamless Construction: Manufactured without a longitudinal weld seam, avoiding weld-related discontinuities associated with welded pipe production.

• Cold-Forming Capability: Cold deformation can provide close dimensional control and a refined surface finish, depending on the manufacturing route and final treatment.

• Warm-Forming Capability: Suitable for manufacturing seamless pipes using warm deformation processes under controlled production conditions.

• Multiple Steel Grades: Supports carbon and alloy steel grades with different strength and hardenability characteristics.

• Defined Quality Groups: Group B specifies chemical composition; Group V specifies chemical composition and mechanical properties; Group G specifies chemical composition and mechanical properties assessed on heat-treated specimens; Group D specifies hydraulic test requirements without standardizing chemical composition or mechanical properties; Group E covers special heat treatment under approved technical documentation.

Our Advantages

1. How Can Dimensional Accuracy Be Verified?

Pipe dimensions are specified according to the applicable dimensional standard, including GOST 8734 for cold-formed seamless pipes and GOST 9567 for precision steel pipes. Outside diameter, wall thickness, length, and dimensional tolerances can be defined in the purchase specification and verified during inspection.

2. How Can the Correct Quality Group Be Selected?

GOST 8733-74 provides five quality groups with different inspection requirements. We clarify whether the order requires chemical composition control, mechanical property verification, hydraulic testing, or special heat treatment before production. This helps align the manufacturing and inspection requirements with the intended application.

3. How Can Material Traceability and Quality Be Confirmed?

Material grade, heat-treatment condition, inspection scope, and acceptance criteria should be agreed before production. Inspection documentation can be specified to cover chemical analysis, tensile testing, dimensional checks, and applicable additional tests. Material identification and test records support verification against the purchase requirements.

Applicable Standards

• GOST 8733-74: Technical requirements for cold-formed and warm-formed seamless steel pipes.

• GOST 8734-75: Dimensional range and requirements for cold-formed seamless steel pipes.

• GOST 9567: Dimensional and technical requirements for precision steel pipes, where applicable.

• GOST 1050: Technical requirements and chemical composition for relevant carbon quality steels.

• GOST 4543: Technical requirements and chemical composition for relevant alloy structural steels.

The applicable editions and standard combinations should be confirmed for each order.

Application

Hydraulic Cylinder Barrel Tubes
Cold-formed seamless steel tubes can be specified for hydraulic cylinder barrels where dimensional accuracy, consistent wall thickness, and suitable mechanical properties are required. The selected steel grade, internal surface requirements, machining allowance, and final heat treatment must be matched to the cylinder design and operating pressure.

Chemical Composition

The following table provides representative chemical composition limits for five commonly used steel grades associated with GOST 8733-74. The chemistry is specified by the relevant steel-grade standards, rather than by GOST 8733-74 alone. Values are in weight percent.

Mechanical Properties

The following minimum mechanical properties are specified in the mechanical-property table of GOST 8733-74 for the listed grades. They apply to the standard's relevant quality requirements and should not be interpreted as universal values for every pipe size, delivery condition, or quality group.