The phrase "a steady speed of" is correct and usable in written English.
It can be used when describing a consistent rate of movement or progress, often in contexts related to transportation or performance metrics.
Example: "The car maintained a steady speed of 60 miles per hour throughout the journey."
Alternatives: "a constant speed of" or "an even pace of".
They started in Wilmington, North Carolina and are headed for San Francisco, driving an old Pontiac & a second-hand trailer at a steady speed of 35 m.p.h.
The system, which had its own work force of about 140 men, carried mail at a steady speed of 30 miles per hour.
For cars, above a steady speed of 40 km/h the noise produced by the interaction of the tyres with the road surface is the dominant noise source.
She starts her working day at 9am, dealing with legal files, setting up appointments, liaising with mental health tribunals and typing up letters at a steady speed of 50wpm.
I explained that the hare was sleeping at a location twelve hundred metres from the finish line; the tortoise passed it at a steady speed of five centimetres per second.
When it was my turn, I saw the cause of the problem: an open white carriage drawn by two elderly horses at a steady speed of about four miles an hour in the direction of the nearest catering hall.
The use of an additional generator on a single shaft together with the pump and the turbine would require revolution control to maintain a steady speed on the part of the generator.
The vehicle was driven across each trial site at a steady speed to produce sets of tracks which consisted of one, two and three vehicle passes.
Delhomme et al. [4] found that older drivers have some driving characteristics, such as driving at a steady speed, conservative use of the accelerator, gear shifting, etc. Ross et al. [5] indicated that most older adults tend to overrate their driving ability.
But once the rate of deceleration is stabilized, constant, and unchanging, the sensation becomes one of hanging there presumably at a steady speed - there is no perception of deceleration (or even of speed for that matter) even though still decelerating.
The case of β < 0 corresponds to a flat plate moving at a steady speed opposite to that of a uniform mainstream [3].
