Piping Interview Questions Part-3 (Material Standards)

Welcome to Hardhatengineer.com. I am Varun Patel. In this video, you will learn about the most common questions regarding pipe fittings material standards that you may face during the interview.

You will learn about these questions;

1. What are the commonly used material for Pipes, butt welding fittings, flanges, and plates?
2. What is the basic difference between ASTM A106 Gr.A / Gr.B/ Gr.C.?
3. What is the basic difference between ASTM A312 TP 304, TP304H and TP 304L?
4. What is low alloy steel, and what is high alloy steel?

So please watch these till the end. And don’t forget to subscribe to my channel because it helps me to increase my reach on YouTube, and you will also get regular updates on new videos. You can subscribe right now by just clicking the subscribe button on your screen. So let’s start with the first question.

Most of the standards that I have explained to you in earlier videos are used for dimensional inspection of the piping components. Some of them are also used for the design of the components. Let’s look at some of the most common material grades used for manufacturing the piping components.

Material questions are a very common practice. An interviewer will ask this question to check your fundamentals. A question such as which material grade of pipe, fittings, or flanged you have worked. To answer this question, you should know some of the most frequently used material grades in piping.

Here I will show you the list of carbon steel, alloy steel, stainless steel, and nickel steel grades. You can visit my website to read and remember these grades.

Carbon steel is used for normal pressure temperature applications. Alloy steel is used for high-pressure temperature applications. Stainless steel is used for corrosive applications. And nickel steel is used for a low-temperature application.

Pipe Material Standards

• Carbon Steel: – ASTM A53 Gr. A/B, ASTM A106 Gr. A/B/C, ASTM A333 Gr.1/Gr.6
• Alloy Steel: – ASTM A335 Gr.P1/P2/P5/P7/P9/P11/P12/P22.
• Stainless Steel: – ASTM A312TP304/TP304L/TP304H/TP308/TP310/TP316/TP316L/ TP316H/TP317/TP321/TP321H/TP347/TP347H/TP348/TP348H.
• Nickel Steel: – ASTM A333Gr.3/ Gr.8.

Tube Material Standards

• Carbon Steel:- ASTM A178/179/192, ASTM A334 Gr.1/6.
• Alloy Steel :- ASTM A161T1, ASTM A213T1/T2/T5/T7/T9/T11/T12/T22.
• Stainless Steel :- ASTM A213 TP304/TP304L/TP304H/TP310/TP316/TP316L/TP316H/ TP317/TP321/TP321H/TP347/TP347H/TP348/TP348H, ASTM A608 HK40.
• Nickel Steel :- ASTM A334Gr.3/Gr.8

Wrought Iron fittings Material Standards

• Carbon Steel :- ASTM A234Gr.WPA/B, ASTM A420 Gr.WPL6.
• Alloy Steel :- ASTM A234 WP1/WP5/WP7/WP9/WP11/WP12/WP22.
• Stainless Steel :- ASTM A403 WP304/WP304L/WP304H/WP309/WP310/WP316/ WP316L/WP316H/ WP317/WP321/WP321H/WP347/WP347H/ WP348.
• Nickel Steel :- ASTM A420WPL6/WPL8.

Forged Fittings Material Standards

• Carbon Steel :- ASTM A181, ASTM A105, ASTM A350 LF1/2.
• Alloy Steel :- ASTM A182F1/F2/F5/F7/F9/F11/F12/F22.
• Stainless Steel :- ASTM A182F6/F304/F304L/F304H/F310/F316/F316L /F316H/F321/F321H/F347/F347H/F348.
• Nickel Steel :- ASTM A350 LF3, ASTM A522.

Plates Material Standards

• Carbon Steel :- ASTM A285, ASTM A515, ASTM A516.
• Alloy Steel:- ASTM A387 Gr.2/Gr.5/Gr.7/Gr.9/Gr.11/Gr.12/Gr.22.
• Stainless Steel :- ASTM A240 TP410/TP405/TP430/TP304/TP304L/TP309/TP310S/ TP316/TP316L/TP317/TP321/TP347/TP348
• Nickel Steel :- ASTM A203 Gr.D/Gr.E, ASTM A353.

As said earlier, you can visit my website hardhatengineer.com for this list. Let’s move to the next question.

What is the difference between ASTM A106 Gr.A / Gr.B/ Gr.C.?

This is a very common question. The difference between Gr A, B &C indicates different % of carbon. A106 Gr A has 0.25% Carbon, Gr B has 0.30%, and Gr C has 0.35% Carbon. Now, remember that this % of carbon will affect the strength and ductility of the material.

What is the difference between ASTM A312 TP 304, TP304H, and TP 304L?

This is also a very similar question to what you have learned earlier. The difference between 304, 304H, and 304L is different % of carbon in these grades. 0.08% max for 304, 0.035% max for 304L, 0.04-0.1% for 304H.

The last question of this video is;

What is low alloy steel, and what is high alloy steel?

The Sum of the percentage of alloying elements in the steel will decide whether steel is called low alloy or high alloy steel.

• Steel is called Low alloy steel if the sum of total Alloying elements is < 5%
• And if the sum of total Alloying elements is > 5%, it is called High alloy steel.

This is the end of the video. I hope that you have learned a lot from this video. In the next video, I will explain to you the flange-related questions. So keep on checking my youtube channel for a new videos.

Visit my website hardhatengineer.com for free study materials and don’t forget to subscribe to my channel to get regular updates on new videos and also like and share my video with your friends. If you want to request a video, please write in the comment. See you soon, goodbye, take care.