1. The Number "1.7362" - The Material Grade
This is a Werkstoff number (material number) from the German standard DIN EN 10216-2. This standard covers "Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties."
The material corresponding to 1.7362 is:
DIN / EN Designation: 25CrMo4
Similar / Equivalent Grades:
AISI / SAE: 4130 (The American equivalent, very close in composition)
UNS: K41303
EN: 1.7218 (This is another, very similar European grade, often considered interchangeable for many applications)
Key Characteristics of 25CrMo4 (1.7362):
Type: A low-alloy, chromium-molybdenum steel.
Key Properties:
High Strength: It can be heat-treated (quenched and tempered) to achieve high tensile and yield strength.
Good Toughness: Maintains good impact resistance.
Good Creep Resistance: Performs well under high stress at elevated temperatures (typically up to about 550-600°C / 1020-1110°F).
Good Weldability: Can be welded with proper procedures (often pre-heating and post-weld heat treatment are required).
Chemical Composition (Typical %):
| Element | Chromium (Cr) | Molybdenum (Mo) | Carbon (C) | Manganese (Mn) | Silicon (Si) |
|---|---|---|---|---|---|
| Content | 0.90 - 1.20 | 0.15 - 0.30 | 0.22 - 0.29 | 0.60 - 0.90 | 0.10 - 0.35 |
2. "Seamless Steel Pipe" - The Form and Manufacturing
Seamless: The pipe is manufactured from a solid cylindrical steel billet. The billet is heated and then pierced through the center to form a hollow tube. This process creates a pipe/tube with no welded seam along its length.
Advantages of Seamless Pipes:
Uniform Strength: The absence of a weld seam means the strength and integrity are consistent around the entire circumference.
Higher Pressure Rating: They are generally stronger and can withstand higher internal and external pressures.
Reliability: Less risk of failure points, making them ideal for critical applications.
Summary: What is a 1.7362 Seamless Steel Pipe?
It is a high-strength, heat-treatable chromium-molybdenum alloy steel pipe with no longitudinal weld seam, designed for use in high-pressure and high-temperature environments.
Common Applications
Due to its excellent combination of strength, toughness, and temperature resistance, 1.7362 seamless pipes are used in demanding industrial sectors:
Oil & Gas Industry:
Downhole tubing and casing
Drill pipes
Process piping in refineries
Power Generation:
High-pressure steam lines in fossil fuel power plants
Boiler tubes and superheater tubes
Automotive and Aerospace:
Hydraulic lines
Structural components (especially in its equivalent AISI 4130 form)
Roll cages
Mechanical Engineering:
Hydraulic cylinders
High-pressure fluid and gas systems
Machinery components requiring high strength-to-weight ratio.
Relevant Standards
This pipe would be supplied according to standards that specify dimensions, tolerances, testing, and inspection. Common standards include:
DIN EN 10216-2: The primary European standard for seamless pressure tubes.
ASTM A519: Standard for seamless carbon and alloy steel mechanical tubing (covers AISI 4130).
ASTM A335: Standard for seamless ferritic alloy-steel pipe for high-temperature service (covers similar grades like P11).
When ordering or using this material, it's crucial to specify not only the grade (1.7362) but also the required dimensions (Outside Diameter and Wall Thickness), length, and the delivery condition (e.g., normalized, quenched and tempered).
