What is the difference between 304, 304H and 304L?

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Time of issue:2021-10-13 13:51
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(Summary description)

What is the difference between 304, 304H and 304L?

(Summary description)

Categories:Industry News
Author:
Origin:
Time of issue:2021-10-13 13:51
Views:

Information

What is the difference between 304, 304H and 304L?

In fact, according to the content of chromium nickel is 304 stainless steel, the composition is containing 18% chromium (Cr), 8% nickel (Ni), but the main difference lies in the different carbon content.

304L is ultra-low carbon stainless steel, the carbon content is reduced to less than 0.03%, can avoid intergranular corrosion, and in theory, the stress corrosion resistance effect is better than 304, but the effect is not obvious in practical application. The purpose of reducing carbon and adding titanium is the same, but the cost of 321 smelting with titanium is higher, the molten steel is thick, and the price is more expensive.

304H H refers to high temperature, high carbon content is the guarantee of high temperature strength, GB150 requirements austenitic steel used in 525 degrees above, carbon content is not less than 0.04%, carbide is strengthening phase, especially high temperature strength is better than pure austenite.

Among the three, the highest carbon content is 304H, the lowest carbon content is 304L, and 304 stainless steel carbon content between the two. The higher the carbon content, the worse the corrosion resistance of stainless steel is, the easier it is to rust. The carbon content also leads to a difference in price, and again, the use of the sentence depends on the requirements.

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In the price-competitive environment of the stainless steel industry, many buyers treat unit price as the sole criterion for selection, ultimately falling into the trap of "low-cost procurement followed by high-cost rework." In reality, as a fundamental industrial material, stainless steel incurs costs throughout the entire lifecycle—from procurement and processing to operation and maintenance. Three key factors—material authenticity, processing precision, and after-sales service—are far more valuable than simply achieving low purchase prices. Material authenticity is the minimum requirement when purchasing stainless steel, and also a common target for low-price traps. Some low-cost suppliers on the market often pass off inferior materials as high-quality ones—using 201 instead of 304, ordinary 304 instead of 316L, or recycled materials with non-standard thickness and subpar composition. Although these materials may appear only slightly cheaper, they can lead to premature corrosion, insufficient strength, and other issues during use, potentially causing safety incidents in chemical or food processing environments. Reputable, physical suppliers provide material quality certificates with each shipment and support spectral testing for verification, ensuring complete consistency in material composition and grade from the source. Processing accuracy directly determines the yield rate and schedule of downstream operations. In stainless steel processing stages such as leveling, slitting, and cutting, there are clear industry standards for dimensional tolerances, flatness, and burr control. Low-cost processing often involves outdated equipment and lax quality control, resulting in excessive slit width tolerances, warped or uneven leveled sheets, and excessive burrs on cut edges. These issues can increase scrap rates in subsequent sheet metal and stamping processes, and even delay overall project timelines due to dimensional mismatches. Although high-precision processing has a slightly higher unit price, it significantly reduces rework and waste downstream, ultimately leading to lower overall costs. Reliable after-sales service is a crucial guarantee for long-term and stable procurement. Low-cost suppliers often lack service capabilities; when issues such as material discrepancies or dimensional deviations arise, they tend to shirk responsibility and delay responses. Some small-scale vendors even lack established after-sales channels, making it difficult to hold them accountable for quality problems. In contrast, trustworthy manufacturing factories offer end-to-end support services, including product selection consultation, order tracking, handling of abnormalities, and timely replacement or reshipment, all backed by clear response mechanisms that significantly reduce buyers' communication and time costs. From a total lifecycle cost perspective, pursuing low prices alone often proves counterproductive. Low-quality materials at lower prices may have a service life only one-third that of qualified products. When combined with hidden costs such as rework, production downtime, and equipment replacement, the overall expenditure can far exceed the cost of purchasing standard-quality materials. Procurement calculations should not focus solely on unit purchase price, but must also consider the comprehensive investment in material lifespan, processing losses, and operational maintenance costs. The essence of stainless steel procurement lies in selecting reliable long-term suppliers, rather than simply opting for the lowest single price. By balancing cost and quality, and prioritizing material grade, precision, and service, true cost reduction and efficiency improvement can be achieved, ensuring stable progress in production and projects.

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