SS 316h vs SS 316: Carbon content
Leave a message
When selecting stainless steel for high-temperature or corrosion-resistant applications, buyers often compare SS 316H vs SS 316. Although both belong to the 316 austenitic family, their carbon content and service performance differ significantly. Understanding this difference helps procurement engineers choose the right material, avoid premature failures, and optimize long-term cost.
What is 316H stainless steel?
SS 316H is a high-carbon variant of Type 316 austenitic stainless steel, featuring added Molybdenum (Mo) for superior corrosion resistance, especially against chlorides and pitting, plus higher strength at elevated temperatures (creep resistance) compared to standard 316/316L, making it ideal for demanding applications like heat exchangers, chemical processing, and marine environments where durability and high-temp performance matter.
What is SS 316 material?
SAE 316 grade stainless steel, sometimes also called A4 stainless steel or marine grade stainless steel, is the second most common austenitic stainless steel after 304/A2 stainless steel. Its main alloying components, besides iron, include chromium, nickel, and molybdenum, with a manganese content as high as 2%. It also contains small amounts of silicon, phosphorus, and sulfur. It can be processed into various product forms, including plates, sheets, coils, strips, pipes, bars, and wires.
SS 316h vs SS 316: Carbon content
| Grade | Carbon Content (C) | Impact |
|---|---|---|
| SS 316 | ≤ 0.08% | Better weldability, lower carbide precipitation, good for general corrosion environments. |
| SS 316H | 0.04% – 0.10% | Higher creep strength, better high-temperature stability, ideal for 500–800°C continuous service. |
Why carbon matters?
The elevated carbon content in 316H increases strength and creep resistance at high temperatures, making it suitable for pressure vessels and heat-intensive production lines.
SS 316h vs SS 316: Chemical Composition (Typical %)
| Element | SS 316 | SS 316H |
|---|---|---|
| Carbon (C) | ≤0.08 | 0.04–0.10 |
| Chromium (Cr) | 16.0–18.0 | 16.0–18.0 |
| Nickel (Ni) | 10.0–14.0 | 10.0–14.0 |
| Molybdenum (Mo) | 2.0–3.0 | 2.0–3.0 |
| Manganese (Mn) | ≤2.0 | ≤2.0 |
| Silicon (Si) | ≤1.0 | ≤1.0 |
| Sulfur (S) | ≤0.03 | ≤0.03 |
| Phosphorus (P) | ≤0.045 | ≤0.045 |
SS 316h vs SS 316:Mechanical Performance
| Property | SS 316 | SS 316H |
|---|---|---|
| Tensile Strength | ~515 MPa | 515–620 MPa |
| Yield Strength | ~205 MPa | ≥ 260 MPa |
| Elongation | ~40% | 35–40% |
| High-Temperature Creep Resistance | Good | Excellent |
What is the difference between 316H and 316L?
Grade 316H has a higher carbon content than 316L, which increases the strength (particularly at temperatures above about 500oC), but should not be used for applications where sensitisation corrosion could be expected. Both 316L and 316H are available in plate and pipe, but 316H is less readily available ex-stock.
SS 316h vs SS 316:Weldability
SS 316H has lower weldability than standard SS 316 (or 316L) due to its higher carbon content (0.04-0.10%), increasing its susceptibility to sensitization and intergranular corrosion after welding, necessitating post-weld heat treatment or low-carbon fillers (like 316L) for better results; while 316 (max 0.08% C) welds well, 316H's carbon boosts high-temp strength, making 316L (max 0.03% C) the top choice for easy welding.
Is 316H stronger than 316?
Yes, 316H has higher tensile and yield strength, especially above 500–800°C. Because it is a high-carbon stainless steel designed for high-temperature environments, it exhibits higher tensile and yield strength at high temperatures while still maintaining excellent corrosion resistance. Standard 316 has good strength and corrosion resistance at room temperature, while 316H sacrifices some weldability (due to its carbon content) in exchange for superior high-temperature performance in applications such as boilers and heat exchangers.
What is the price of 316H stainless steel?
Market price varies with nickel and molybdenum trends.316H sheet/plate: USD 3,000–3,450 / tonActual price depends on thickness, surface finish, and origin .
316, 316L, and 316H stainless steels are available in most major GNEE products. 316 and 316L are in the highest demand. These grades are produced in various forms, such as plates, bars, tubes, and pipes. 316 and 316L are readily available for quick delivery.
316H stainless steel is less common and is typically used for special applications. Lead times for 316H may be longer, especially for large orders or custom sizes. Engineers specifying 316H for high-temperature projects should plan ahead.
Here is a brief list of supply considerations:
✅ 316 and 316L: Standard sizes and shapes available in stock.
✅ 316H: In stock, but may require special ordering or longer lead times.
✅ Custom Specifications: Special shapes or finishes may extend waiting times.
