Chemical composition of duplex steel stainless steel heat exchange tube

Categories:Industry News
Author:HAOSTEEL
Origin:Technical knowledge
Time of issue:2024-05-16 11:41
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(Summary description)

Chemical composition of duplex steel stainless steel heat exchange tube

(Summary description)

Categories:Industry News
Author:HAOSTEEL
Origin:Technical knowledge
Time of issue:2024-05-16 11:41
Views:

Information

Chemical composition of duplex steel stainless steel heat exchange tube

The four main classifications of dual-phase steel heat exchange tubes are:

The first category is a low-alloy type, representing the brand UNS S32304L(23Cr-4Ni-0.1N), the steel does not contain molybdenum, the PREN value is 24 ~ 25, and can replace AISI 304L or 316 in stress corrosion resistance.

The second category belongs to the medium alloy type, representing the brand UNS S31803(22Cr-5Ni-3Mo-0.15N), the PREN value is 32 ~ 33, and its corrosion resistance is between AISI 316L and 6%Mo+N austenitic stainless steel.

The third class is a high alloy type, generally containing 25% Cr, also contains molybdenum and nitrogen, and some also contain copper and tungsten, the standard grade has UNS S32550(25Cr-6Ni-3Mo-2Cu-0.2N), PREN value is 38 ~ 39, the corrosion resistance of this type of steel is higher than 22% Cr of duplex stainless steel.

The fourth type of super duplex stainless steel, containing high molybdenum and nitrogen, the standard grade is UNS S32750 (25Cr-7Ni-3.7Mo-0.3N), some also contain tungsten and copper, PREN value is greater than 40, can be applied to harsh medium conditions, with good corrosion resistance and mechanical properties, comparable to super austenitic stainless steel

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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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