Stainless Steel, Grade Information
Stainless 304
Grade 304 is the world's most widely used stainless steel, 18% chromium and 8% nickel, found in kitchens, industry, and architecture everywhere.
Periodic Table Position
History & Interesting Facts
Stainless steel's discovery is attributed to English metallurgist Harry Brearley of Sheffield, who in 1913 was researching corrosion-resistant steel alloys for gun barrels. He noticed that samples containing around 13% chromium did not rust. Sheffield's steel heritage made it the ideal birthplace for this revolutionary material. The development of the 18/8 formulation (18% chromium, 8% nickel), what we now call 304, followed in the 1920s, producing a stainless steel with superior corrosion resistance and formability. The material was quickly adopted for cutlery (Sheffield cutlery manufacturers were early adopters), kitchen equipment, and medical instruments. Sheffield remains proud of this heritage, and "Sheffield Steel" became a global byword for quality. By WWII, stainless steel was being used in aircraft exhaust systems, medical instruments, and food processing equipment.
Historical Uses
Grade 304 stainless steel established itself in the 20th century across a remarkable range of applications. Its corrosion resistance and hygienic properties made it the standard material for commercial kitchen equipment: sinks, worktops, cooking vessels, and refrigeration units. The food and beverage industry adopted stainless steel vats, piping, and tanks universally, dairy processing, brewing, wine-making, and soft drink production all depend on 304 stainless for its non-reactive, cleanable surfaces. The medical instrument industry, syringes, scalpels, clamps, and surgical trays, relies on 304 stainless for its autoclavability. Architecture adopted polished 304 stainless for cladding, handrails, and decorative features. The New York Chrysler Building's crown is clad in Nirosta steel (a 304-family alloy), an iconic early architectural use from 1930.
Current Uses
Grade 304 is used wherever corrosion resistance, cleanability, and moderate strength are required. Commercial catering, every restaurant, hotel, and hospital kitchen uses 304 stainless sinks, benches, and cooking equipment. Domestic kitchen sinks are almost universally 304 stainless in both the UK and globally. Chemical processing plants use 304 for tanks and pipework handling weak acids and alkaline solutions. Transport fuel systems use 304 for fuel tanks and pipework that must resist fuel corrosion. Automotive exhaust systems from the catalytic converter rearward commonly use 304-family stainless. Architectural handrails, balustrades, and cladding on modern buildings are predominantly 304 stainless. Medical and dental equipment, food processing machinery, and pharmaceutical manufacturing equipment are standard 304 applications.
Future Possible Uses
Stainless 304 will remain central to food processing, pharmaceutical, and chemical industries where hygiene and corrosion resistance are non-negotiable. Growing global food production to serve an expanding population will drive demand for stainless food processing equipment. The hydrogen economy, where hydrogen is produced, stored, and distributed as an energy carrier, requires stainless steel for electrolysers (hydrogen production units), pressure vessels, and pipework that must handle pure hydrogen without embrittlement. Some grades of 304 are suitable for this. The expansion of nuclear power globally for low-carbon baseload energy will drive demand for nuclear-grade stainless steel in reactor pressure vessels and primary coolant systems. Stainless steel in architecture, particularly highly polished or satin-finish for premium buildings, remains a growing design specification.
Where Does This Scrap Come From?
Stainless 304 scrap arises from the replacement and decommissioning of commercial kitchen equipment, food processing plant, pharmaceutical manufacturing lines, and chemical plant. Restaurant and hospitality refurbishments generate stainless kitchen sinks, benches, and shelving. Hospital and care home refurbishments contribute medical equipment and fixtures. Food and drink manufacturing plant, brewery tanks, dairy vessels, and soft drink lines, provides large quantities when upgraded. Construction demolition yields stainless handrails, cladding, and architectural features. Automotive dismantlers recover stainless exhaust systems. Fabrication workshops generate stainless offcuts. The key challenge is distinguishing 304 from other stainless grades (particularly 316, which is more valuable, and lower-value ferritic grades), XRF analysis is essential for accurate sorting and pricing.
How Is It Remanufactured?
Stainless steel 304 scrap is sorted by grade using XRF analysers or magnet testing (304 is paramagnetic, a weak magnet has slight attraction), then baled or shredded. It is charged into electric arc furnaces (EAF) or argon oxygen decarburisation (AOD) converters along with chromium and nickel additions to achieve the target composition. The AOD process blows a mixture of oxygen and argon through molten steel, reducing carbon content while retaining chromium, a critical step as chromium would be lost to slag if conventional decarburisation were used. The refined steel is cast into slabs, billets, or ingots. Slabs are hot-rolled into coil or plate. The key alloying elements, chromium and nickel, are expensive, so precise scrap composition analysis saves significant costs. Recycled 304 is indistinguishable from primary 304 and commands the same prices in the market.
5-Year Price Trend & Forecast
Stainless 304 scrap prices are driven by nickel (the most valuable alloying element) and to a lesser extent chromium. LME nickel prices have been extremely volatile over 2021–2026, spiking to a historic $100,000/tonne during a short squeeze in March 2022, before being reset and stabilising in a $15,000–20,000/tonne range. UK scrap yard prices for stainless 304 have ranged approximately from £700 to £1,500 per tonne over this period, tracking nickel market movements. In early 2026, stainless steel prices recovered modestly from 2023–2024 lows as nickel supply concerns from Indonesia (a major producer) emerged. Analysts note that stainless 304 scrap is becoming increasingly important as primary nickel supply growth moderates and EV battery demand competes for nickel supply.
Note: All scrap yard prices paid by QuickStop Metals are calculated as a percentage of the prevailing LME or spot market price, updated daily. Check today's prices →
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