Ss pipe 1.4306 / 1.4307 grade

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Ss pipe 1.4306 / 1.4307 grade

Reliable Pipes & Tubes – Manufacturer, Supplier & Exporter of Ss pipe 1.4306 / 1.4307 grade

Reliable Pipes & Tubes is a leading manufacturer, supplier, stockist, and exporter of high-quality Ss pipe 1.4306 / 1.4307 grade in India. We manufacture our pipes in accordance with national and international quality standards, ensuring maximum corrosion resistance, durability, and reliability under challenging industrial environments.

Grade 1.4306 (X2CrNi19-11) is an acid-resistant austenitic stainless steel with low carbon, increased chromium (18-20%), and increased nickel content (10-12%). It is an improved version of 1.4307 (X2CrNi18-9 / AISI 304L), which also features reduced carbon content to prevent carbide precipitation during welding. These grades offer exceptional weldability and are widely used where standard 304 material is insufficient and increased corrosion resistance is required.

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Why Compare 1.4301, 1.4306 & 1.4307 Grades?

When selecting austenitic stainless steels for critical piping applications, understanding the differences between 1.4301 (AISI 304), 1.4306 (AISI 304L - high nickel/chrome), and 1.4307 (AISI 304L - standard low carbon) is essential. Choosing the right grade impacts weldability, intergranular corrosion resistance, compliance, and cost-efficiency.

  • Grade 1.4301 (X5CrNi18-10 / AISI 304): The most popular, basic, and mature chromium-nickel stainless steel grade with excellent general corrosion resistance.
  • Grade 1.4307 (X2CrNi18-9 / AISI 304L): Features a reduced carbon content compared to 1.4301, minimizing carbide precipitation during welding and preventing intergranular corrosion. Often supplied as double-certified (304/304L).
  • Grade 1.4306 (X2CrNi19-11): Features additionally reduced carbon content alongside increased chromium (18-20%) and nickel (10-12%) to provide even higher acid and corrosion resistance compared to standard 304L/1.4307.

Chemical Composition Comparison (%)

Grade / W.Nr. C Mn Si P S Cr Ni N Other
1.4301 (X5CrNi18-10) <0.07 <2.0 <1.0 <0.045 <0.015 17.5 - 19.5 8.0 - 10.5 <0.11 -
AISI 304 (UNS S30400) <0.08 <2.0 <1.0 <0.045 <0.030 17.5 - 20.0 8.0 - 11.0 <0.10 -
1.4306 (X2CrNi19-11) <0.03 <2.0 <1.0 <0.045 <0.015 18.0 - 20.0 10.0 - 12.0 <0.10 -
1.4307 (X2CrNi18-9) <0.03 <2.0 <1.0 <0.045 <0.030 17.5 - 19.5 8.0 - 10.0 <0.11 Cu < 1.0
AISI 304L (UNS S30403) <0.03 <2.0 <1.0 <0.045 <0.030 17.5 - 20.0 8.0 - 13.0 <0.10 -
1.4303 (X4CrNi18-12) <0.06 <2.0 <1.0 <0.045 <0.030 17.0 - 19.0 11.0 - 13.0 <0.11 -
AISI 304LN (UNS S30453) <0.03 <2.0 <1.0 <0.045 <0.030 18.0 - 20.0 8.0 - 12.0 0.10 - 0.16 -

Mechanical Properties of 1.4306 (X2CrNi19-11)

Property Value
Tensile Strength (Rm)500 - 750 N/mm² (MPa)
Yield Strength (Rp0.2)>180 N/mm² (MPa) Min
Elongation (A)>45% Min
Hardness (HB)<215 Max
Modulus of Elasticity (E)220 GPa

Mechanical Properties of 1.4301 / 1.4307 (AISI 304 / 304L)

Property Value
Tensile Strength (Rm)460 - 700 N/mm² (MPa)
Yield Strength (Rp0.2)>190 N/mm² (MPa) Min
Elongation (A)>45% Min
Impact Strength (KV)>60J Min
Modulus of Elasticity (E)200 GPa
Hardness (HB)<215 Max
Linear Expansion Coefficient (α)16.0 × 10-6 K-1
Thermal Capacity (cp at 20°C)500 J · kg-1 · K-1
Thermal Conductivity (λ)15 W · m-1 · K-1
Electrical Resistivity (Ω)0.73 μΩ·m

Properties of Cold-Rolled Strips (according to EN 10151)

  • +C700 - Tensile Strength (Rm): 700 - 850 MPa | Elongation (A): >25%
  • +C850 - Tensile Strength (Rm): 850 - 1000 MPa | Elongation (A): >12%
  • +C1000 - Tensile Strength (Rm): 1000 - 1150 MPa | Elongation (A): >5%
  • +C1150 - Tensile Strength (Rm): 1150 - 1300 MPa | Elongation (A): >3%
  • +C1300 - Tensile Strength (Rm): 1300 - 1500 MPa | Elongation (A): >1%

Mechanical Properties at Elevated and Lowered Temperatures (1.4306)

Properties / Temperature (°C) -196 -150 -80 50 100 150 200 250 300 350 400 450 500 550
Tensile Strength, Rm (MPa) >1250 >1100 >860 >494 >450 >420 >400 >390 >380 >380 >380 >370 >360 >330
Yield Strength, Rp0.2 (MPa) >300 >315 >270 >190 >157 >142 >127 >118 >110 >104 >98 >95 >92 >90

Applications of Ss pipe 1.4306 / 1.4307 grade

Thanks to their low-carbon structure and superior corrosion and weldability characteristics, these pipes are widely utilized in standard and highly aggressive environments across multiple industries:

  • Chemical and Petrochemical Processing
  • Food & Beverage Processing (contact with Citric, Tartaric, Acetic acids)
  • Pharmaceutical and Medical Equipment
  • Gas, Steam, and Chemical Drainage Systems
  • Automotive and Rail Exhaust Systems
  • Power Generation & Heat Exchangers
  • Pulp & Paper Production
  • Cryogenic Applications and Low-Temperature Storage

Heat Treatment Processes

  • Saturation: 1000 - 1100°C
  • Hot forming: 1200 - 900°C

Equivalent Grades & International Designations

  • W.Nr 1.4306: X2CrNi19-11, AISI 304L, TP304L, UNS S30403, SUS304L, 03Х18Н11, 00H18N10
  • W.Nr 1.4307: X2CrNi18-9, AISI 304L, TP304L, 08Х18Н10, SS2333, Z3CN18-10
  • W.Nr 1.4301: X5CrNi18-10, AISI 304, TP304, UNS S30400, SUS304, 08Х18Н10, 0H18N9

Frequently Asked Questions (FAQs)

What is the difference between 1.4306 and 1.4307?

Grade 1.4306 is an improved version of 1.4307 (304L) featuring increased nickel (10-12% vs. 8-10%) and chromium (18-20% vs. 17.5-19.5%), providing higher acid resistance and general corrosion resistance in critical environments.

Can 1.4306 / 1.4307 grade pipes be welded easily?

Yes, both grades feature low carbon content (less than 0.03%), which significantly reduces carbide precipitation during welding, ensuring excellent weldability and high resistance to intergranular corrosion after welding.

What are the temperature limits for 1.4306?

Grade 1.4306 has excellent mechanical properties at both high and low temperatures, retaining high tensile and yield strengths from -196°C to 550°C.

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