Stainless steel grades 18/0, 18/8, and 18/10 are food-grade materials commonly used as flatware. Besides domestic applications, these steels are valued by manufacturers for their durability, corrosion resistance, and thermal properties.
The labels 18/0, 18/8, and 18/10 reflect their metal content. The first number, ‘18’, indicates the chromium percentage while the second denotes the nickel content. These variations alter their physical and mechanical properties. But how exactly?
Continue reading to find out how 18/0, 18/8, and 18/10 stainless steels differ. This article will compare their elemental composition, grade, physical and mechanical properties, cost, and applications.
What is 18/10 Stainless Steel?
18/10 stainless steel is commercially known as Type 304. It is a higher-end version of stainless steel, containing 18% chromium and 10% nickel. It has the highest amount of nickel, which gives it a bright appealing finish and durability. This is why it’s often used for quality flatware and high-end kitchen appliances.
In manufacturing terms, 18/10 stainless steel is made by melting all the alloying elements inside a furnace, decarburizing them, and then molding them to the desired shape.
18/10’s higher nickel content gives many desired properties but also adds on cost. It is non-magnetic and harder to machine relative to others. Although 18/19 is corrosion-resistant, it cannot endure saltwater environments.
What is 18/8 Stainless Steel?
18/8 stainless steel also belongs to the same commercial steel grade 304. But this one has a slightly lower nickel content, precisely 8%. Like 18/10 stainless steel, it belongs to the austenitic stainless steel family, known for its non-magnetic nature and excellent corrosion resistance. It cannot undergo heat treatment.
The manufacturing process is similar to 18/10 steel with a slightly lower proportion of nickel content. However, since the composition doesn’t differ much, most properties overlap. It’s food-safe and one of the common stainless steels for flatware. Another edge is its comparatively lower cost than 18/10.
What is 18/0 Stainless Steel?
18/0 comes from a class, Grade 430, as in the AISI system. It contains no nickel but the same 18% chromium content. It is not corrosion resistant as the other two. However, the cost is not too high as well.
18/0 stainless steel is magnetic and its affordability compared to the other two makes it a common choice for budget-friendly flatware.
Comparing 18/8, 18/10, and 18/0: The Key Differences
The earlier sections gave brief information about each stainless steel type. Now, let’s breakdown things further and see how each one differs:
Composition
All three grades contain the same percentage of chromium – 18%. However, the nickel content varies among these grades, which is reflected in their names. 18/8 stainless steel has 8% nickel, 18/10 has 10% nickel, while 18/0 contains no nickel at all. Nickel is responsible for the property changes that follow.
Grade/Series
Two of the stainless steel grades, 18/8 and 18/10, fall into the 300 series, specifically under Grade 304. This category is characterized by an austenitic mix, known for its excellent corrosion resistance, enhanced formability, and high durability.In contrast, 18/0 stainless steel is part of the 400 series, specifically Grade 430, a ferritic variety distinct from the 300 series. It is magnetic, more cost-effective due to the absence of nickel, and offers moderate corrosion resistance.
Physical Properties
The shine and luster are functions of nickel content – the more it is the brighter the steel is. Stainless steel 18/10 is on the top list with a much brighter surface finish. It’s followed by 18/8 and then 18/0, which exhibits a less lustrous finish due to a lack of chromium.
As for weight, it’s similar in all three iron is a predominant entity. 18/10 may feel a bit sturdy, but in reality, the weight difference is negligible.
Mechanical and Machining Properties
Steel grade 18/10 is considered the strongest among the three due to its higher nickel content, which enhances its corrosion resistance and contributes to greater overall strength. Whereas, 18/0 has least strength among the three.
Corrosion resistance also follows the same trend among three and for the same reason. However, the machinability is completely opposite to it. Stainless steel 18/0 is easier to machine due to its ferritic nature whereas 18/10 is hardest to machine.
Cost
Nickel is an expensive alloying element, so its amount provides a good estimate of costs. 18/10 steel, having the most amount of nickel, is the most expensive grade of all. 18/8 is bit cheaper than 18/8 but higher than 18/0. Among the three steels, 18/0 is the cheapest.
Applications
18/0 stainless steel is commonly used for budget flatware and household utensils. Its magnetic properties make it suitable for motors and appliances that can utilize magnetic functionality.
18/8 steel offers a balance of durability and resistance to corrosion. So, it also used for everyday kitchenware, professional cookware, and marine applications.
18/10 is preferred for high-end cookware, cutlery, and kitchen appliances due to its excellent corrosion resistance and high durability. Medical instruments also rely on this steel.
| Property | 18/0 Stainless Steel | 18/8 Stainless Steel | 18/10 Stainless Steel |
|---|---|---|---|
| Nickel Content | 0% | 8% | 10% |
| Commercial Grade | 430 | 304 | 304 |
| Series | 400 Series (Ferritic) | 300 Series (Austenitic) | 300 Series (Austenitic) |
| Physical Properties | Less lustrous, magnetic | More lustrous, non-magnetic | Most lustrous, non-magnetic |
| Strength | Good | Moderate | High |
| Corrosion Resistance | Moderate | High resistance | Highest resistance |
| Machinability | Easiest to machine | Moderate machinability | Most challenging to machine |
| Cost | Affordable | Moderate | Most expensive |
| Applications | Budget flatware | Kitchen utensils, marine applications, food processing equipment | High-end cookware, cutlery, medical instruments |
Case Study: Controlling Weld Distortion in 304 Stainless Steel
The grades discussed in this article — 18/8, 18/10, and 18/0 — all share the same 18% chromium backbone, but their nickel content and crystal structure determine how they behave in the workshop, not just on the shelf. Stainless steel 18/0 is easier to machine due to its ferritic nature, whereas 18/10 is the hardest to machine. That machinability gap matters most when a part requires welding followed by precision finishing — a combination that exposes the full difficulty of working with austenitic 304 stainless steel. The following case from Richconn’s engineering team documents what it takes to hold 0.1 mm perpendicularity on a welded 304 assembly for precision equipment.
- Part: 304 Stainless Steel Welded Assembly
- Industry: Precision Equipment
- Material: 304 Stainless Steel (18/8, Type 304)
- Process: Welding + CNC Machining + Surface Grinding
- Outcome: Pass rate improved from 60% to 98%+
The Challenge
The customer required that key mounting faces on this welded 304 stainless steel assembly maintain perpendicularity within 0.1 mm. On paper, 0.1 mm sounds manageable. In practice, 304 stainless steel makes this target genuinely difficult to hit through a welding process.
The difficulty comes from three compounding factors, each feeding into the next. First, 304 stainless steel has low thermal conductivity and a high coefficient of thermal expansion. Heat introduced during welding does not dissipate evenly — it concentrates at the weld zone, and the uneven heating and cooling cycle causes the part to distort as a whole. Second, conventional welding methods such as TIG introduce a large heat input, which amplifies that distortion at a macroscopic level. Third, even after the part cools and appears dimensionally stable, the welding process has locked significant residual stress into the material. When that stress releases — during subsequent machining or over time — the part distorts again. This secondary distortion is what makes post-weld machining of 304 assemblies so unpredictable without deliberate stress management.
Before the process was redesigned, the pass rate on this component was 60%. Four parts in ten were failing to meet the perpendicularity requirement, generating rework costs and delivery risk.
The Solution: A Four-Stage “Prevent — Correct — Finish — Lock” Strategy
Richconn’s engineering team addressed all three root causes in sequence rather than treating them independently.
- Pre-weld annealing (solution annealing of the base material) — Before any welding began, the raw 304 stock was solution annealed to relieve manufacturing-induced internal stress and restore the material’s plasticity. Starting with a stress-neutral blank means the subsequent welding process is not adding distortion forces on top of pre-existing ones. This is the prevention step: reducing the stress state of the input material so that welding-induced distortion is as small as possible from the outset.
- Post-weld machining correction — After welding, the assembly was rough-machined to correct macroscopic distortion, restore datum planes, and remove dimensional deviation before any precision work was attempted. Attempting precision grinding on a distorted blank would simply transfer the distortion into the finished surface. Correction must come before finishing.
- Precision surface grinding of critical faces — Key faces were finish-ground on a high-precision surface grinder to achieve the final geometric tolerances and surface finish. Grinding — rather than milling — was chosen for the final step because it removes material in a controlled, low-force manner that does not introduce new stress or distortion into a part that has already been stabilized.
- Pre-assembly tack welding with a dedicated fixture — During final assembly, a custom-built precision fixture was used to locate all components accurately before tack welding locked the geometry in place. Final welding was only performed after the positional accuracy was confirmed and frozen by the tack welds. This is the “lock” step: hardening the precision established in the previous stages so that the final weld pass cannot undo it.
The Result
Perpendicularity on all key mounting faces was held within 0.1 mm. The pass rate rose from 60% to over 98%, eliminating the majority of rework that had been driving up cost and threatening delivery schedules. The customer accepted the parts at first inspection with no reported issues.
What This Case Illustrates
The article above explains that 18/8 (304) stainless steel — the material in this case — sits between the easier-to-machine 18/0 and the more corrosion-resistant 18/10, offering a practical balance of properties for a wide range of applications. What that comparison does not fully capture is the welding behavior: 304’s austenitic structure and low thermal conductivity make it one of the more difficult stainless grades to weld without distortion.
The key lesson from this case is that distortion control in 304 welded assemblies is not a single intervention — it is a sequence. Annealing before welding reduces the starting stress state. Machining correction after welding addresses what the weld introduced. Precision grinding establishes the final geometry. Fixture-controlled tack welding locks it in before final joining. Skipping or reordering any step undermines the ones that follow. When all four are executed in the right sequence, 0.1 mm perpendicularity on a welded 304 assembly is not just achievable — it is repeatable at 98%+ yield.
How Richconn Can Help?
Stainless steel is a valuable material in both domestic and commercial settings due to its durability and corrosion resistance. if you need machining services specifically for stainless steel or any other common metals like aluminum, copper, or nickel, Richconn is here to assist. At Richconn, we offer comprehensive CNC metal machining services that meet industry standards and precision requirements. It doesn’t matter if your project is large or small. Just contact us and bring your ideas to life.
