2017年7月22日 · Overall, the 122-SG differed little in purpose from its German predecessor, but the firepower of the 122 mm howitzer was much greater than of the 7.5 cm StuK. It was enough to defeat any German tank, although the main target of the 122-SG was, of course, light fortifications and strongholds.

1943年3月，Uralmash工厂设计了一种改进的SU-122，被命名为SU-122M，安装有122毫米的U-11榴弹炮。 这种炮可以使用M-30型炮的炮弹。 但是政府测试却显示SU-122M的设计有很多缺点，比如底盘超载，造价昂贵，因为这些，SU-122M最终没有投产。

The SU-122 (from Samokhodnaya Ustanovka 122 mm) was a Soviet self-propelled howitzer or assault gun used during World War II. The number "122" in the designation represents the caliber of the main armament, a 122 mm M-30S howitzer .

The SU-122 was the first major variant of the successful T-34 chassis. After the first German Sturmgeschütz assault guns were seen in operations, an order was issued in April 1942 to several design bureaus to devise plans for a prototype SPG.

The vehicle was indexed Self-Propelled Howitzer SG-122 (StuG) (Samohodnaya Gaubitsa SG-122 (Artshturm)), more commonly called just SG-122 and sometimes SU-122/T-3. The crew consisted of a driver, a commander, two loaders, and a gunner.

su-122以其强大的火力和优良的防护在前线赢得好评。 43年5月，装备了新型炮弹的SU-122具备了在远距离摧毁敌军坦克装甲车辆的能力，包括德军的重型虎式坦克。

The project designed by the group of engineers lead by A. Kashtanov was very simple. The new vehicle was based on the captured German StuG III with a new, more spacious, fighting compartment that allowed the mounting of the 122 mm Howitzer M-30 (the same as on the Soviet SU-122). Why exactly the 122 mm howitzer?

On 19.10.1942, the Soviet authorities ordered the development of a self-propelled howitzer of 122 mm caliber. Work on such a weapon began at Plant No. 592 and (possibly) UZTM . The prototype was completed at Plant No. 592 in late 1942.

The SG-122 was armed with the same howitzer but was based on the chassis of an ex-German StuG III. In July 1942, the SG-122 was accepted for service, but was considered unsuccessful and hard to maintenance, so it was quickly removed from service.

The vehicle was based on the chassis of the T-34 medium tank. The SG-122 was armed with the same howitzer but was based on the chassis of an ex-German StuG III. In July 1942, the SG-122 was accepted for service, but was considered unsuccessful and hard to maintenance, so it was quickly removed from service.