Al-6XN (UNS N08367) steel introduction

Al-6XN (UNS N08367) is a high-performance super austenitic stainless steel with excellent corrosion resistance, high strength and high temperature resistance. It is widely used in industrial fields under harsh environments.

Implementation standards:

ASTM B688, ASTM A240, ASTM B676, ASTM B675, ASTM B564 International names: Al-6XN, desulfurization and denitrification alloy, UNS N08367, Cronifer1925hMo, Incoloy alloy25-6HN, NAS 255NM

Key physical properties

Density: 8.24g/cm³24

Hardness: HBW≤90, HRB≤10024

Melting point: 1320-1400℃4

Resistivity: 0.11Ω·mm²/m2

Elastic modulus: 193-194GPa

Mechanical properties

Tensile strength: σb≥650Mpa, yield strength σb≥295Mpa: elongation: δ≥35%, hardness; HRB90

Core material characteristics

1. Corrosion resistance: It has super strong resistance to chloride pitting, crevice corrosion and stress corrosion cracking, and its corrosion resistance is close to Hastelloy C-276, better than 316L stainless steel, and more cost-effective134. The annual corrosion rate can be as low as 0.1mm4 in a 60% sulfuric acid environment (below 80℃).

2. High strength and toughness: Due to the addition of significant nitrogen elements in the alloy, the tensile strength is ≥650MPa, the yield strength is ≥295MPa (some standards are ≥365MPa), the elongation is ≥35%, and the impact toughness is maintained at 45.

3. High temperature resistance and thermal stability: It still maintains high strength at high temperatures, has excellent oxidation resistance, low thermal expansion coefficient, and good thermal conductivity. It is suitable for high-temperature flue gas desulfurization, chemical reactions and other scenarios

Typical application areas

With its comprehensive performance advantages, Al-6XN (N08367) is widely used in the following scenarios:

1. Petrochemical: chemical containers, pipelines, offshore oil and gas platform equipment, especially suitable for high chloride and acidic environments.

2. Environmental protection and energy: flue gas desulfurization (FGD) devices, thermal power plant pipelines, nuclear power plant servo water systems.

3. Food and pharmaceuticals: food processing equipment, pharmaceutical reaction vessels, meet sanitary requirements.

4. Marine engineering: seawater heat exchangers, ship components, outstanding resistance to seawater corrosion.

Market supply and usage precautions

1. Market situation: Currently, many suppliers provide products in the form of bars, tubes, plates, etc., and the price is affected by specifications, quantity and suppliers.

2. Heat treatment requirements: The recommended solution treatment process is 980-1150℃ insulation for 1-2 hours and rapid air cooling or water cooling to restore corrosion resistance.

3. Safe operation: High temperature operation procedures must be followed during use to avoid long-term exposure to extremely corrosive media under strong stress.

Performance advantage summary

Al-6XN (N08367) balances corrosion resistance, strength and cost through the "high Cr-Mo-N" alloying design, becoming an ideal alternative material between 316L stainless steel and high nickel alloys, especially in chloride, high temperature and complex chemical environments. It is an economical choice under harsh working conditions.