DF-5B / CSS-4 Mod 2
As of mid-2002 China was replacing the CSS-4 Mod 1 ICBMs with longer range CSS-4 Mod 2s. The replacement of all the approximately 20 CSS-4 Mod 1s was expected to be completed by mid-decade. Compared with the Dongfeng-5A ballistic missile, the Dongfeng-5B has greatly improved its performance, and its maximum range has reached 1.5. Ten thousand kilometers, the range of impact can cover the entire United States, and the Dongfeng-5B can carry 4 to 6 sub-guided nuclear warheads with a hit accuracy of 500 to 2000 meters. In fact, the Dongfeng-5B ballistic missile is very similar to the Russian R-36M ballistic missile (Chinese name Satan) in terms of range, launch mode, gimmick and fuel system, and sub-guided nuclear warhead. Satan is the world. The most powerful and powerful active missile, it is clear that the Dongfeng-5B ballistic missile has also become China's Satan.
China's ballistic missile modernization began before it assessed that the United States would deploy a missile defense, but China likely will take measures to improve its ability to defeat the defense system in order to preserve its strategic deterrent. The measures likely will include improved penetration packages for its ICBMs, an increase in the number of deployed ICBMs, and perhaps development of a multiple warhead system for an ICBM, most likely for the CSS-4.
R&D on multiple independent reentry vehicles (MIRVs) was initiated as early as 1970. On 20 September 1981 China launched three scientific satellites into space orbit from a single booster, and many in the West mistakenly regarded this as indicating that China might possess the technology to develop multiple, independently targetable reentry vehicles (MIRVs). But the launch tested neither a MRV nor a MIRV, and indeed one of the three satellites was merely attached to the tail-deck of the second stage.
The initial force of DF-5A missiles was deployed with single warhead, but in November 1983 China inaugurated a DF-5 modification program to arm these ICBMs with MIRVed warheads. Technical difficulties, however, slowed the program. The DF-5A, able to strike targets in the continental United States (CONUS), was the designated recipient of the MIRVs, although there was no evidence that they had been deployed. Some sources in the 1990s claimed that at least four DF-5As had already been MIRVed, though it is generally asserted that while MIRVing may occur within the next few years no DF-5s had yet been fitted with MIRVed warheads.
Based on the DF-5A throwweight and warhead shroud the missile could be equipped with six reentry vehicles with each RV weighing 600 kgs (the size of the single warhead on the DF-21). The DF-5A second stage apparently has four vernier engines which reportedly fire for 190 seconds after the main missile engine cuts off. Thus the DF-5A could direct a warhead bus over a fairly large arc covering an array of aim points. But the exact status of this program cannot be confirmed based on open sources.
On 3 September 2015, the People's Republic of China displayed missiles marked DF-5B during a parade in Beijing to mark the 70th anniversary of the end of World War II. In May 2015, the U.S. Department of Defense had noted that China’s ICBM arsenal included multiple independently-targetable re-entry vehicle (MIRV) equipped Mod 3 (DF-5) ICBMs. The "B" model are these MIRV-equipped DF-5 missiles.
Speculation its basic performance and Dongfeng -5 are similar, but it could carry 4-6 separate guided nuclear warheads, which is mainly directed against the US anti-missile system.
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