Superheated Steam Table — 40 bar (4 MPa)
Specific volume, internal energy, enthalpy, entropy, density and isobaric specific heat of superheated steam at 40 bar (4 MPa), computed from IAPWS-IF97 — the same formulation the SimuPipe solver uses. Rows run from the saturation temperature (250.36 °C) to 800 °C in 20 °C steps.
| T (°C) | v (m³/kg) | ρ (kg/m³) | u (kJ/kg) | h (kJ/kg) | s (kJ/kg·K) | cp (kJ/kg·K) |
|---|---|---|---|---|---|---|
| 250.36Sat. | 0.049777 | 20.0898 | 2601.8 | 2800.9 | 6.0697 | 4.0217 |
| 260 | 0.051777 | 19.3136 | 2630.1 | 2837.2 | 6.1384 | 3.5536 |
| 280 | 0.055495 | 18.0197 | 2680.9 | 2902.9 | 6.2594 | 3.0774 |
| 300 | 0.058868 | 16.9872 | 2726.2 | 2961.7 | 6.3638 | 2.8199 |
| 320 | 0.062021 | 16.1236 | 2768.2 | 3016.3 | 6.4575 | 2.6536 |
| 340 | 0.065019 | 15.3800 | 2808.1 | 3068.1 | 6.5435 | 2.5399 |
| 360 | 0.067904 | 14.7267 | 2846.5 | 3118.1 | 6.6237 | 2.4604 |
| 380 | 0.070702 | 14.1439 | 2883.9 | 3166.7 | 6.6993 | 2.4042 |
| 400 | 0.073432 | 13.6181 | 2920.6 | 3214.4 | 6.7712 | 2.3642 |
| 420 | 0.076108 | 13.1392 | 2956.9 | 3261.4 | 6.8400 | 2.3359 |
| 440 | 0.078740 | 12.7000 | 2992.9 | 3307.9 | 6.9061 | 2.3162 |
| 460 | 0.081336 | 12.2947 | 3028.7 | 3354.0 | 6.9700 | 2.3027 |
| 480 | 0.083901 | 11.9187 | 3064.4 | 3400.0 | 7.0318 | 2.2941 |
| 500 | 0.086441 | 11.5686 | 3100.1 | 3445.8 | 7.0919 | 2.2892 |
| 520 | 0.088958 | 11.2412 | 3135.8 | 3491.6 | 7.1503 | 2.2872 |
| 540 | 0.091456 | 10.9342 | 3171.5 | 3537.3 | 7.2073 | 2.2875 |
| 560 | 0.093938 | 10.6454 | 3207.4 | 3583.1 | 7.2629 | 2.2896 |
| 580 | 0.096404 | 10.3730 | 3243.3 | 3628.9 | 7.3172 | 2.2933 |
| 600 | 0.098857 | 10.1156 | 3279.4 | 3674.8 | 7.3704 | 2.2982 |
| 620 | 0.101299 | 9.8717 | 3315.7 | 3720.9 | 7.4226 | 2.3042 |
| 640 | 0.103731 | 9.6404 | 3352.1 | 3767.0 | 7.4737 | 2.3111 |
| 660 | 0.106153 | 9.4204 | 3388.7 | 3813.3 | 7.5238 | 2.3188 |
| 680 | 0.108567 | 9.2109 | 3425.5 | 3859.8 | 7.5731 | 2.3271 |
| 700 | 0.110973 | 9.0112 | 3462.5 | 3906.4 | 7.6215 | 2.3360 |
| 720 | 0.113373 | 8.8205 | 3499.7 | 3953.2 | 7.6691 | 2.3453 |
| 740 | 0.115766 | 8.6381 | 3537.2 | 4000.2 | 7.7160 | 2.3551 |
| 760 | 0.118154 | 8.4635 | 3574.8 | 4047.4 | 7.7621 | 2.3652 |
| 780 | 0.120537 | 8.2962 | 3612.7 | 4094.8 | 7.8075 | 2.3757 |
| 800 | 0.122915 | 8.1357 | 3650.8 | 4142.5 | 7.8523 | 2.3865 |
u is not tabulated independently. Specific internal energy follows from the enthalpy and specific volume as u = h − p·v, with p in MPa and v in m³/kg (1 MPa·m³/kg = 1000 kJ/kg). At 40 bar (4 MPa) that pressure term is worth 491.7 kJ/kg at 800 °C, so u and h are far apart at high pressure and nearly equal at low pressure — a common source of error when the wrong column is read.
The first row is saturated vapour, at 250.36 °C. Below that temperature at 40 bar (4 MPa) the water is a liquid or a two-phase mixture, and this table does not apply — use the saturated tables instead.
Values are IAPWS-IF97, not interpolated. Every row is evaluated directly from the industrial formulation at that exact temperature, so there is no interpolation error between rows. If you need a temperature between the 20 °C steps, the calculator computes it exactly.