Overview of  API 5ct N80-1 and N80Q

Differences Between API 5CT N80-1 and N80Q
API 5CT N80-1 and N80Q are two different grades of casing and Tubing that are commonly used in the Oil and gas industry. While they may seem similar at first glance, there are some key differences between the two that are important to understand.

API 5CT N80-1 is a standard grade for tubing that is used in most environments where normal casing and tubing is required. It has a minimum yield strength of 80,000 psi and a minimum tensile strength of 95,000 psi. This grade is suitable for most oil and gas wells and provides good resistance to corrosion and cracking.

Tensile and Hardness Requirements
Grade     Yield Strength MPa Tensile Strength Hardness a,c specified Wall thickness Allowable Hardness Variation b
  Type Total Elongation Under Load   min MPa max    
      min max   HRC HBW mm HRC
1 2 3 4 5 6 7 8 9 10
H40 0.5 276 552 414
J55 0.5 379 552 517
K55 0.5 379 552 655
N80 1 0.5 552 758 689
N80 Q 0.5 552 758 689
R95 0.5 655 758 724
L80 L80 1 0.5 552 655 655 23 241
L80 9Cr 13Cr 0.5 552 655 655 23 241
    0.5 552 655 655 23 241
C90 1 0.5 621 724 689 25.4 255 £12.70 3
                12.71 to 19.04 4
                19.05 to 25.39 5
                ³ 25.40 6
T95 1 0.5 655 758 724 25.4 255 £12.70 3
                12.71 to 19.04 4
                19.05 to 25.39 5
                ³ 25.40 6
C110 0.7 758 828 793 30 286 £12.70 3
                12.71 to 19.04 4
                19.05 to 25.39 5
                ³ 25.40 6
P110 0.6 758 965 862
Q125 1 0.65 862 1034 931 b £12.70 3
                12.71 to 19.04 19.05 4
                  5
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9.
c For through-wall hardness tests of Grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number.
          Calculated Mass c
    Nominal Linear Mass T& C b,c Wall Thick- ness       em, Mass Gain or Loss Due to End Finishing d
Labels a Outside Diameter     Inside Diameter Drift Diameter Plain- end kg
              round Thread Buttress Thread
            wpe        
  D kg/m t D mm kg/m Short Long RC SCC
  mm   mm mm            
1 2 3 4 5 6 7 8 9 10 11 12
7 17 177.8 25.6 5.87 166.06 162.88 24.89 7.61
7 20 177.8 29.91 6.91 163.98 160.8 29.12 6.74 — 7.94 — 8.28 — 0.58
7 23 177.8 34.67 8.05 161.7 158.75 e 158.52 156.24 153.90 33.7 6.26 7.94 8.28 0.58
7 23 177.8 34.67 8.05 161.7 152.40 e 33.7 6.26 7.37 7.65 –0.54
7 26 177.8 39.14 9.19 159.42 151.6 38.21 5.79 6.79 7.13 –0.69
7 29 177.8 43.6 10.36 157.08 149.32 42.78 6.23 6.4 –1.31
7 32 177.8 47.92 11.51 154.78 147.18 47.2 6.23 6.4 –1.31
7 32 177.8 47.92 11.51 154.78 142.86 47.2 5.68 5.79 –1.91
7 35 177.8 52.09 12.65 152.5 139.72 51.52 5.18 5.24 –2.47
7 38 177.8 56.1 13.72 150.36 136.52 55.52
7 42.7 177.8 63.84 15.88 146.04 133.38 63.41
7 46.4 177.8 69.35 17.45 142.9 130.18 69.01
7 50.1 177.8 74.85 19.05 139.7   74.58
7 53.6 177.8 80.21 20.62 136.56   79.93
7 57.1 177.8 85.42 22.22 133.36   85.25      
7 5/8 24 193.68 35.72 7.62 178.44 175.26 34.96 7.11 — 8.58 — 9.12 — 2.59
7 5/8 26.4 193.68 39.29 8.33 177.02 173.84 38.08 6.78 7.91 8.38 1.84
7 5/8 29.7 193.68 44.2 9.52 174.64 171.46 43.24 7.13 7.51 0.98
7 5/8 33.7 193.68 50.15 10.92 171.84 168.66 49.22 6.16 6.44 – 0.10
7 5/8 39 193.68 58.04 12.7 168.28 165.1 56.68 5.32 5.5 –1.03
7 5/8 42.8 193.68 63.69 14.27 165.14 161.96 63.14 4.87 5.01 –1.52
7 5/8 45.3 193.68 67.41 15.11 163.46 160.28 66.54 4.48 4.57 –1.96
7 5/8 47.1 193.68 70.09 15.88 161.92 158.74 69.63
7 5/8 51.2 193.68 76.19 17.45 158.78 155.6 75.84
7 5/8 55.3 193.68 82.3 19.05 155.58 152.4 82.04      
7 3/4 46.1 196.85 68.6 15.11 166.63 165.10 e 67.72
7 3/4 46.1 196.85 68.6 15.11 166.63 163.45 67.72

On the other hand, API 5CT N80Q is a higher strength grade that is specifically designed for more demanding applications. It has a minimum yield strength of 80,000 psi and a minimum tensile strength of 95,000 psi, just like N80-1. However, N80Q also has a maximum hardness requirement of 23 HRC, which is higher than the maximum hardness requirement of N80-1. This increased hardness provides better resistance to wear and tear, making it suitable for harsher environments.

One of the main differences between N80-1 and N80Q is their heat treatment process. N80-1 is typically normalized and tempered to improve its mechanical properties, while N80Q is quenched and tempered. This difference in heat treatment results in different microstructures and mechanical properties for the two grades. N80Q has a higher strength and hardness compared to N80-1, which makes it more suitable for high-pressure and high-temperature applications.

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Another important difference between N80-1 and N80Q is their chemical composition. While both grades have similar chemical compositions, N80Q has slightly higher levels of carbon and manganese. These higher levels of carbon and manganese contribute to the increased strength and hardness of N80Q.
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In terms of availability, N80-1 is more commonly used and readily available in the market compared to N80Q. This is because N80-1 is suitable for most oil and gas wells, while N80Q is only required for more demanding applications. However, N80Q can still be easily sourced from Manufacturers and Suppliers.

In conclusion, API 5CT N80-1 and N80Q are two different grades of casing and tubing that are used in the oil and gas industry. While they have similar mechanical properties, N80Q has a higher strength and hardness compared to N80-1, making it suitable for more demanding applications. The heat treatment process and chemical composition of the two grades also differ, resulting in different microstructures and properties. N80-1 is more commonly used and readily available, while N80Q is specifically required for harsher environments. Understanding these differences is crucial for selecting the appropriate grade of casing and tubing for specific oil and gas well conditions.

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