Mechanical Properties Terms for Seamless Pipe

Index analysis of mechanical properties of seamless pipes (smls pipe):

1. The performance index analysis of seamless pipe--plasticity.

Plasticity refers to the ability of metal materials to produce plastic deformation without being damaged under load.

2. Analysis of performance index of seamless pipe--hardness.  

Hardness is a measure of the hardness of metal materials. At present, the commonly used method for measuring hardness in production is the indentation hardness method, which uses a certain geometric indenter to press into the surface of the metal material to be tested under a certain load, and the hardness value is determined according to the degree of indentation. Commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV) and other methods.

3. The performance index analysis of seamless pipe--fatigue.
The strength, plasticity, and hardness discussed above are all indicators of the mechanical properties of metals under static load. In fact, many machine parts are working under cyclic loads, under which conditions the parts will fatigue.

4. Seamless performance index analysis--impact toughness.  

The load acting on the machine at a very large speed is called impact load, and the ability of metal to resist damage under impact load is called impact toughness.

5. Analysis of the performance index of seamless pipes--strength.  

Strength refers to the ability of metal materials to resist damage (excessive plastic deformation or fracture) under static load. Since the load acts in the form of tension, compression, bending, shearing, etc., the strength is also divided into tensile strength, compressive strength, flexural strength, and shear strength. There is often a certain connection between various strengths, and tensile strength is generally used as the basic strength indicator in use.

How to determine the mechanical properties requirements of seamless pipes?

Step 1: First understand the "working conditions" - determine the performance level

Step 2: Lock in the "product standard" - the standard gives all mechanical indicators at one time

Step 3: Extract “quantitative indicators” – convert standard clauses into tables

Take 15CrMoG (GB/T 5310-2025) for high-pressure boilers as an example:

Step 4: Clarify the “test method” – ensure data traceability

Step 5: Add a “verification clause” to the contract

Certificate: EN 10204 3.1/3.2 or GB/T 247 quality assurance certificate.

Lossless: UT (GB/T 5777 C5), ET (GB/T 7735 Class A).

Re-examination: If any indicator fails, double sampling will be conducted for re-examination. If it fails again, the entire batch will be scrapped.

Identification: Spray code "furnace batch number + standard number + impact temperature" for easy traceability.

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