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15CrMoG seamless steel pipe and thick-walled large-diameter seamless steel pipe purchase guide

Views: 1     Author: Site Editor     Publish Time: 2025-06-20      Origin: Site

Dear friends, when purchasing 15CrMoG seamless steel pipe or thick-walled large-diameter seamless steel pipe, do you often encounter these problems: Don’t understand the material performance? Can’t understand the specification parameters? Don’t know how to choose due to the large price difference? Don’t worry, I will help you sort out your thoughts!


First, the common pain points of seamless steel pipes

1. Material confusion: What does the "G" in 15CrMoG seamless steel pipe stand for? What is the difference with ordinary 15CrMo seamless steel pipes?

2. Specification selection: How thick is the "thickness" of thick-walled seamless steel pipes? What will be the impact of a larger diameter of seamless steel pipes?

3. Price trap: Why do the quotations of seamless steel pipes with the same nominal value differ by 30% or even more?

4. Quality concerns: How to identify inferior seamless steel pipes? Is ultrasonic flaw detection really reliable?


Second, a practical guide to the purchase of seamless steel pipes

1. Analysis of the material characteristics of seamless steel pipes

15CrMoG is a chromium-molybdenum alloy steel for boilers. "G" means it is dedicated to boilers. Compared with ordinary 15CrMo:

- More stringent control of carbon content (0.12-0.18%)

- Lower phosphorus and sulfur content requirements (≤0.025%)

- High-temperature mechanical properties data must be provided

2. Specification selection tips for seamless steel pipes

Thick-walled large-diameter seamless steel pipes (usually refers to outer diameter ≥219mm, wall thickness ≥20mm) should pay attention to:

- For every 1mm increase in wall thickness, the pressure bearing capacity increases by about 5-8%

- Large-diameter seamless steel pipes are preferably heat-expanded to avoid weld problems

- Common misunderstandings: The thicker the wall thickness of seamless steel pipes, the better. Weight cost and installation difficulty should be considered

3. Four-step method for quality identification of seamless steel pipes

① Look at the surface: The inner and outer walls of high-quality seamless steel pipes are smooth, without cracks or folds

② Dimensions: Measure with a caliper, the tolerance should be within ±1%

③ Check the certificate: Material report and heat treatment record must be provided

④ Test: It is recommended to sample for a water pressure test or ultrasonic test


Suggestions for using and maintaining seamless steel pipes

1. Welding points: 15CrMoG seamless steel pipes need to be preheated to 150-200℃ before welding, and slowly cooled after welding

2. Anti-corrosion measures: Both ends of the seamless steel pipes should be sealed when stored to avoid rust inside the seamless steel pipes

3. Regular inspection: It is recommended to measure the wall thickness of seamless steel pipes every 2 years under high pressure environment

Hunan Great Steel Pipe Co.,Ltd
Hunan Great Steel Pipe Co.,Ltd is a world-class production and service provider of submerged arc straight seam welded pipe as the first subsidiary of Shinestar Group. Hunan Great Steel Pipe Co.,Ltd pays more attention to in the pipeline engineering research areas as a pioneer of China Petroleum Pipeline & Gas Pipeline Science Research Institute.

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