As from 1st January 1970 the PSC, by a decision of Ministry of Shipping, was assigned to concentrate exclusively on tramp services. The Szczecin based operator was forced to transfer all its general cargo vessels and m/f "Gryf" to another Polish company "Polskie Linie Oceaniczne". This transfer included 46 vessels of the aggregate tonnage 111 thousand dwt. In the result Polsteam remained at the end of 1970 with a fleet of 102 vessels totalling 961 thousand dwt and a staff of 4949 employees.
Between the year 1971 and 1975 the Polsteam fleet received a record number of 54 vessels aggregating 2.1 million dwt and by the end of 1975 the company operated 122 vessels of 2.8 million deadweight.
This immense tonnage growth was the effect of a government concept to import huge amounts of crude oil from Iraq. A fleet of six supertankers ranging from 137 000 dwt to 146 000 dwt entered the Polsteam fleet.
Kasprowy Wierch. 1974 - 1983.
vessel's details They were the biggest vessels ever under Polish flag. „Kasprowy Wierch” was the first of them. The vessel was built in Hamburg. She was put to sea for her maiden voyage in October 1974. Alas, already in 1975 the world shipping faced an oil crisis and the price of crude oil rose to a level at which import of the crude oil from Middle East became very costly, similarly like seaborne transportation of the crude oil.
The first of the biggest vessels was. M/t „Kasprowy Wierch” It was built in Hamburg and put to sea for her maiden voyage in October 1974.
Thus the seventies started with a decreased activity but also with a record number of newbuildings entering service.
Ziemia Mazowiecka. 1967 - 1989.
vessel's details Between the year 1971 and 1975 the Polsteam fleet received a record number of 54 vessels aggregating 2.1 million dwt and by the end of 1975 the company operated 122 vessels of 2.8 million deadweight. The company tonnage increased threefold within five years.
A concept of building a fleet of liquid sulphur carriers which was also implemented at that time proved to be much better bargain.
In 1970 Polsteam signed with Siarkopol an agreement on carriage of liquid sulphur and, in consequence, in the seventies Polsteam, with 800 thousand tons of sulphur transported annually became the world leader in that market and the company has retained that position until now.
In the second half of that decade the Polsteam fleet growth slowed considerably but the ship owner took advantage of its tonnage to strengthen its position in the world market of bulk cargo carriers.
Apart from traditional cargoes such as coal and iron ore Polsteam vessels carried more and more grain. In 1977 regular grain transports from American Great Lakes to Swinoujście began. Grain was also transported in large quantities from US South and from France. In September 1977 Polsteam vessel „Ziemia Mazowiecka” loaded the 250 millionth ton of cargo transported by Polsteam fleet.