Mercedes-Benz
From 1954 to 1955, he was part of the Mercedes-Benz factory team, as a junior driver behind Juan Manuel Fangio, Karl Kling, Hermann Lang and later Stirling Moss. When the Silver Arrows came back for the 1954 French Grand Prix to score a 1–2 win, Herrmann drove the fastest lap but had to retire. A podium finish at the 1954 Swiss Grand Prix was his best result in that year as he had to use older versions of the Mercedes-Benz W196, or the least reliable car.
In the 1955 Argentine Grand Prix his team mates Kling and Moss had to abandon early due to the extremely hot conditions on the southern hemisphere in January. Herrmann was called in to share his car with them for a 4th place finish, giving one point each. Fangio won with two laps more. Hans was quick in the 1955 Mille Miglia with the Mercedes-Benz 300 SLR, comparably or even faster than Moss, but was less lucky than in 1954, as he had to abandon the race.
A crash in practise for the 1955 Monaco Grand Prix put Herrmann out for the ill-fated 1955 season, even though a comeback in the Targa Florio was intended.
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