Norsok M-650 Qualification Forging Flanges

Norsok M-650 Qualification Forging Flanges

NORSOK M-650 qualified forging flanges are high-integrity forged flanges manufactured and tested in accordance with NORSOK M-650 requirements for critical offshore and oil & gas applications.
This qualification ensures that the manufacturer, material, and manufacturing process are capable of producing consistent, defect-free forgings suitable for harsh service conditions.

What Is NORSOK M-650?

NORSOK M-650 is a Norwegian standard that defines qualification requirements for manufacturers of special materials, including forgings, castings, pipes, and fittings, used in offshore and petroleum industries.

Scope of NORSOK M-650 Qualified Forging Flanges

NORSOK M-650 qualification typically applies to forged flanges manufactured to standards such as:

  • ASME B16.5 / ASME B16.47

  • EN 1092-1

  • Custom project specifications

Qualified materials may include:

ASTM A182 F51,

ASTM A182 F53,

ASTM A182 F55,

ASTM A182 F60,

ASTM B564 N08825,

ASTM B564 N06625

ASTM A182 F51 Forging Flanges Of Norsok M-650 Qualification
No. Test Product Requirement
1 Chemical Composition C Mn P S Si Cr Ni Mo N
≤0.03 ≤2 ≤0.03 ≤0.02 ≤1 21-23 4.5-6.6 2.5-3.5 0.14-0.20
2 Tensile Test Tensile Strenght ≥620Mpa ,Yield Strenght (0.2% offset)≥450Mpa,Elongation After Fracture % (G=50mm)≥25
3 Impact Test ASTM A370 (Test temp – 46℃ Avg ≥45J Single ≥35)
4 Metallographic Analysis ASTM E 562-19
Ferrite Content 35%~55%
ASTM A923-14 Method A
5 Pitting Conrrosion Test ASTM G48 Method A

 

ASTM A182 F60 Forging Flanges Of Norsok M-650 Qualification
No. Test Product Requirement
1 Chemical Composition C Mn P S Si Cr Ni Mo N
≤0.03 ≤2 ≤0.03 ≤0.02 ≤1 22-23 4.5~6.5 3.0-3.5 0.14-0.20
2 Tensile Test Tensile Strenght ≥655Mpa ,Yield Strenght (0.2% offset)≥450Mpa,Elongation After Fracture % (G=50mm)≥25
3 Impact Test ASTM A370 (Test temp – 46℃ Avg ≥45J Single ≥35)
4 Metallographic Analysis ASTM E 562-19
Ferrite Content 35%~55%
ASTM A923-14 Method A
5 Pitting Conrrosion Test ASTM G48 Method A

 

ASTM A182 F53 Forging Flanges Of Norsok M-650 Qualification
No. Test Product Requirement
1 Chemical Composition C Mn P S Si Cr Ni Mo N Cu
≤0.03 ≤1.2 ≤0.035 ≤0.02 ≤0.8 24-26 6~8 3~5 0.24-0.32 ≤0.5
2 Tensile Test Tensile Strenght ≥750Mpa ,Yield Strenght (0.2% offset)≥550Mpa,Elongation After Fracture % (G=50mm)≥25,HBW≤310
3 Impact Test ASTM A370 (Test temp – 46℃ Avg ≥45J Single ≥35)
4 Metallographic Analysis ASTM E 562-19
Ferrite Content 35%~55%
ASTM A923-14 Method A
5 Pitting Conrrosion Test ASTM G48 Method A

ASTM A182 F55 Forging Flanges Of Norsok M-650 Qualification
No. Test Product Requirement
1 Chemical Composition C Mn P S Si Cr Ni Mo N W Cu
≤0.03 ≤1 ≤0.03 ≤0.01 ≤1 24-26 6~8 3~4 0.2-0.3 0.5-1.0 0.5-1.0
2 Tensile Test Tensile Strenght 750-895 Mpa ,Yield Strenght (0.2% offset)≥550Mpa,Elongation After Fracture % (G=50mm)≥25
3 Impact Test ASTM A370 (Test temp – 46℃ Avg ≥45J Single ≥35)
4 Metallographic Analysis ASTM E 562-19
Ferrite Content 35%~55%
ASTM A923-14 Method A
5 Pitting Conrrosion Test ASTM G48 Method A

ASTM B564 N08825 Forging Flanges Of Norsok M-650 Qualification
No. Test Product Requirement
1 Chemical Composition Ni Cr Fe Mn C Cu Si S Mo Al Ti
38~46 19.5~23.5 ≤22 ≤1 ≤0.05 1.5~3 ≤0.5 ≤0.03 2.5~3.5 ≤0.2 0.6~1.2
2 Tensile Test Tensile Strenght ≥585Mpa ,Yield Strenght (0.2% offset)≥241Mpa,Elongation After Fracture % (G=50mm)≥30

NORSOK M-650 qualified forging flanges provide the highest level of reliability for critical offshore and oil & gas applications.

 

Download FAQ-NORSOK-M650-Rev4

NORSOK M-650 Products

ASTM A182 F51 Weld Neck Flanges

ASTM A182 F51 Blind Flanges

ASTM A182 F53 Weld Neck Flanges

ASTM A182 F55 Weld Neck Flanges