Why must materials such as 304H, P11, P91, and LF2 be imported?

When the idea of abiding by rules and avoiding deceit takes root in the hearts of frontline workers and ordinary people, I will trust the quality of whatever products China produces. But at this stage, the only way to avoid problems is to conduct inspections one by one on-site. How much will this cost?

Reply to 2# Boiler operator: Our site policy requires 100% spectral testing for materials such as P11, P22, P91, 304H, and FL2; moreover, there are also some quality issues with those from abroad.

Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Why is this? Lift it up downstairs

I have also been working with valves (automatically controlled valves) for some time now, and I feel that there are indeed serious problems with the materials used in China. There is very limited understanding regarding the performance of these materials and their mechanical strength; the level of basic material research in China is extremely poor. I wonder if the original poster has been to a valve casting workshop. How many such workshops have strict standards? Various types of scrap steel are thrown into electric furnaces, and the mixing ratios are determined based on experience – I really have nothing to say about that.

Reply to 4# 516387460: Hehe, maybe~ Let’s support domestic products and make China stronger

Replying to 6# chenbo_1976 is a serious problem. . . But I believe it will get better and better{:1_90:}

The domestic standards need to be updated and improved; in particular, the organizations responsible for setting standards and those responsible for auditing should not abandon the spirit of science for their own self-interest.

Perhaps as Chinese people, we all want to support domestic products and help make our China stronger. But we Chinese just don’t do things thoroughly; we tend to rely on formalities and try to be clever, thinking that we’re smarter than everyone else and that our methods can deceive anyone. Take the S and P content in domestic steel as an example; the standards set for S and P content in China are much higher than those specified by ASTM. Why is that? Because we Chinese are smart, if the standard specifies that the S and P content should be ≤0.035%, then they will allow us to produce materials with an S and P content of 0.035%. Recently, we have used square tubes made of Q235B and Q345D in our structural work; one batch of such materials failed the re-inspection, and all the material certification documents were fake, although they appeared to meet the standards. Some materials are simply concerning to use – they manage to absorb 3 units of energy upon impact at 10°C. I hope that in China, there will be less reliance on cleverness and formalism, and more focus on practicality. It is also hoped that **the relevant quality inspection departments will play an active role.

It is very difficult for an individual or a company to change the current fate of domestic products. Even if they are more expensive, I would prefer to buy imported goods; if something goes wrong with domestic products, who will be held responsible?

Reply to 10# lynfern: With exposure to a vast array of steel raw materials, one can roughly understand the underlying *rules at play. What was mentioned above is just one phenomenon. The market for end-use products in society is filled with products from private *enterprises; whether it’s steel raw materials, semi-finished products, or finished products (including elbows, flanges, tees, etc.), these products have low prices and poor quality. They may work fine for 1–3 years, but why do such products have such strong viability and high demand? Is it due to demand, excessive *profits, or a loss of commercial *integrity? Project quality comes in second or third place here; maximizing profits is the top priority. Take Shanghai’s numerous steel spot markets as an example – if one takes the time to observe them, they can see through the truth. Hehe, once people enter a realm of dishonesty, they can overcome anything!