Here is a good source.
Its a Russian report on the Lend Lease material supplied by the USA to Russia
df78d3da0fe55d965333035cd9d4ee2770550653.pdf (histrf.ru)
A couple of Highlights
Armor steel had a special place in these shipments, especially in the production of tanks, self-propelled guns and other equipment. Mobilization reserve of armored steel in the Soviet Union before the war was small and did not cover even 6-month industry needs. According to some data, 525.4 thousand tons of rolled steel of all types was delivered to the USSR under Lend-Lease. Every month, the country received about half of average amount of Soviet production of armored steel. Special steel for gun barrel drifting was also delivered
Moreover, copper deficiency in our country decreased largely due to the imports of communications equipment from the United States. For example, the USSR received 956.7 thousand miles of field telephone cable, 2.1 thousand miles of marine cable and 1.1 thousand miles of underwater cable. A lot of radio stations, receivers and radars, produced from copper, were also stationed
During the war, 622 thousand tons of rails were delivered under LendLease. This represents about 56.5% of the total domestic production of rails from mid-1941 to the end of 1945. If excluding narrow gauge rails that were not supplied under lend-lease, then the American supplies made 83.3% of the total production of the Soviet broad gauge rails. Thus, more than half of rails used on Soviet railways during the war came from the United States. The sharp decline in the production of rails in Soviet industry allowed to send extra power and resources of steel to produce weapons (in 1945, rails production made 13% from the 1940 level, and in 1944 - only 5.4%). Lend-Lease supplied not only the rails with armature, but also rolled railway wheels and axles. At that time the USSR did not have technology and capacity to fabricate them, so it had to produce them of cast iron or steel.
Marshal Zhukov gave an assessment of metal supply in the USSR. His remarks given in 1963, which were stored in the Central Archives of the Russian Defense Ministry, are listed below: «Right now they say that the Allies never helped us... But you cannot deny that Americans drove many materials, without which we would not be — 120 — able to form our reserves and could not continue the war ... And how much steel they supplied! Could we quickly establish the production of tanks, if not for American aid? And now they show it in a way that we had plenty of sources.»
The following is a statement from the USA included in the report which the Authors say 'It differs from our data, but in general, provides a comprehensive picture.'
By November 30, 1944, the Soviet Union was supplied with the following number of arms and equipment: 12,200 aircraft (the largest number in comparison with other countries), 135,000 machine guns, 294,000 tons of explosives, 6,000 tanks, 1,800 self-propelled guns, 13,000 pistols, 3,300 armored personnel carriers, 8,200 guns of different calibers (including antitank), 5,500 artillery tractors. In addition, the USSR received 1,300,300 tons of oil and 638,000 tons of chemicals. With the help of Lend-Lease, the problem of uniform for Soviet troops was solved. It earlier emerged as a result of the loss and destruction of many factories. By November 1944, 11 million pairs of combat boots, 97 million yards of cotton fabric, and 50 million yards of woolen goods were delivered to the Soviet Union.»