What is K9 Thunder? The Story of South Korea’s World Export Champion 155 mm Howitzer and the Turkish T-155 Fırtına

The most exported modern self-propelled howitzer in the world is the K9 Thunder, made in South Korea. The 47-ton howitzer produced by Hanwha Aerospace is in service in approximately 1,900 units across 10 countries and holds 52% of the modern artillery market. It has been sold to Poland (308 units), Egypt (200+), India (100+), Norway (24), Finland (48), Australia, Romania, Vietnam, and more. But the strongest story of the K9 took place in Turkey: Production began in 1999 with technology transfer from Samsung Techwin, and 281 units were produced as T-155 Fırtına by MKE. From this foundation, Turkey reached export products like Fırtına II and Boran 155 through domestic development. We compiled this from open sources.

At a Glance

What is K9 Thunder?

K9 Thunder is a 155 mm 52 caliber self-propelled howitzer produced by South Korea’s Hanwha Aerospace (formerly Samsung Techwin, later Hanwha Techwin). Its design began in 1989 by South Korea’s Agency for Defense Development (ADD); it is positioned as a modern alternative to the US M109 Paladin. The first delivery to the Republic of Korea Army was made in December 1999.

The K9 has three features that distinguish it from ordinary howitzers: (1) A long barrel of 52 calibers — the standard range is 41-54 km, reaching 54 km with the K315 LAP round for K9A1. (2) 3 rounds can be fired in 15 seconds (MRSI — multiple rounds simultaneous impact: multiple rounds hitting a single target at the same time). (3) 87% domestic production — a symbol of technological independence for the Korean defense industry.

What is it Used For?

• Long-range fire support: Engaging enemy infantry and armored units from behind the front lines with a range of 41-54 km. Thanks to its explosive fire capability, it can drop 3 rounds on a single target simultaneously.
• Mobile artillery maneuver: 67 km/h road speed + 360 km range — unlike traditional towed artillery, it allows for rapid repositioning and protection from counter-battery fire.
• Multi-role artillery capability: HE (high explosive), APFSDS, laser-guided Excalibur compatible ammunition, and a planned hypersonic missile launcher for the future (for K9A3).
• Cooperating K10 ammunition supply vehicle: An armored supply vehicle carrying 104 rounds on the same chassis — ensures the gun can fire continuously on the battlefield.

Technical Specifications

MRSI = Multiple Rounds Simultaneous Impact — multiple shells hit the same target simultaneously with different trajectories; it is much more destructive than a single shell impact. 52 caliber = the ratio of barrel length to caliber; longer barrel = higher shell velocity = longer range. LAP = Low Aerodynamic Profile — low drag long-range shell.

Turkey Connection: The Story of T-155 Fırtına (A Success Story of the Turkish Defense Industry)

K9 Thunder has a special story for Turkey. The Turkish Armed Forces were modernizing their old M52 howitzers at the end of the 1990s. The Samsung Techwin team made a presentation in Turkey in May 1999; discussions were held with the Land Forces Command in October 1999, and a military-defense cooperation agreement was signed with South Korea on November 18, 1999. In December, a Turkish engineering delegation completed inspections in Korea.

On May 4, 2000, the Korean Ministry of National Defense and the Turkish Land Forces signed an MOU for 350 K9 systems. Prototypes were assembled by the end of 2000; on December 30, 2000, a new name was given: Fırtına. Winter tests were successfully completed in Sarıkamış in February-March 2001. On July 20, 2001, Samsung Techwin and the Turkish Embassy signed the official contract — a total of 350 vehicles for 280 military + 70 for export, with a budget of 1 billion dollars.

MKE (Machinery and Chemical Industry) produced 281 T-155 Fırtına between 2004-2015. After the production line was completed, BMC Defence also joined from 2019 onwards. But the story didn’t end here: Turkey developed Fırtına II based on the K9 platform — with a domestic fire control system, domestic engine integration, and ROKETSAN developed long-range shells. Turkey also developed the Boran 155 truck-mounted howitzer system — a new Turkish solution for the export market with wheeled mobility that K9 lacks.

Today, the T-155 Fırtına family is actively serving in the Azerbaijan inventory and played a decisive role in the 2020 Karabakh Victory. Turkey’s domestic ammunition development and the export of Boran 155 initially transitioned a licensed Korean product to the Turkish defense industry’s fully independent export capability.

Operators and Contracts

Total production by 2025 is 1,900 units. Hanwha Aerospace’s order by the end of 2025 is 52.3 trillion won (approximately $38 billion) — about 5 years of production visibility.

Variants

• K9: Original series (1999-2018) — 5 crew, 41 km range.
• K9A1 (2018+): Automatic fire control, GPS + INS navigation, APU (auxiliary power unit), thermal camera, fire extinguishing system, 54 km range.
• K9A2 (target 2027): 3 crew (increased automation), 9-10 rounds/min high rate of fire, 60 km range.
• K9A3 (in development): Remote-controlled, LiDAR sensor, targeting over 100 km range — drone artillery concept.
• K10 ARV: Ammunition supply vehicle, with a capacity to carry 104 rounds.
• T-155 Fırtına (Turkey): 281 produced by MKE, followed by domestic developments Fırtına II + Boran 155.
• AHS Krab (Poland): PK9 chassis + UK BAE Systems M777 turret — also delivered to Ukraine.
• K9 Vajra-T (India): Locally produced by Larsen & Toubro, desert/mountain configuration.
• AS9 Huntsman (Australia): NATO standard, locally produced in Geelong.
• K9FIN Moukari (Finland): NATO integration package.
• K9 VIDAR (Norway): Adapted for Arctic conditions.
• K9A1EGY (Egypt): Desert filters + locally compatible ammunition fire control.

Examples from Around the World

• M109A7 Paladin (USA): 28 tons, 155 mm 39 caliber, 30 km standard range. Lighter than K9 but shorter range. Unit cost ~5.6 million $.
• PzH 2000 (Germany, KMW): 55 tons, 155 mm 52 caliber, 30-40 km range. Same class as K9 — Germany’s premium product. Also sold to Ukraine. Unit cost ~17 million $ (4 times more expensive).
• CAESAR 8×8 (France, Nexter): 32 tons, 155 mm 52 caliber, wheeled platform. Not self-propelled but similar capability, lower cost. Unit ~6 million $.
• RCH-155 (Germany, KMW): Wheeled 155 mm on Boxer 8×8. European competitor to K9.
• 2S35 Koalitsiya-SV (Russia): 55 tons, 152 mm 52 caliber, automatic loader. Russian counterpart to K9; production is limited.

Comparison with Turkish Counterpart: K9 vs T-155 Fırtına II

Frequently Asked Questions

What is the difference between K9 Thunder and T-155 Fırtına?
Two howitzers derived from the same platform. T-155 Fırtına was produced in Turkey at MKE with a license agreement in 2001, totaling 281 units. Turkey then developed Fırtına II by adding domestic fire control (ASELSAN) and long-range ammunition (ROKETSAN); subsequently, it introduced the Boran 155 truck-mounted version as its own product to the export market.

What is the unit price of K9?
The price for the Republic of Korea Army in 2021 was approximately 4 billion won (~3 million $). Export packages vary between 6-11 million $ with local production and modifications (contracts with Poland, Romania).

What is the range of K9?
With the standard K307 HE shell, it has a range of 41 km, and with the K9A1’s K315 LAP shell, it reaches 54 km. The ERM-HE shell expected to be released in 2026 will extend the range to 60 km. The K9A3 prototype aims for over 100 km.

In which countries is K9 used?
Active service in 10 countries: South Korea (600+), Turkey (281), Poland (308+96), Egypt (200+), India (100), Norway (24+24), Finland (48), Estonia (24), Australia (30), Romania (54), Vietnam (108 contracts).

What is AHS Krab in Poland?
A 155 mm howitzer produced by Poland’s domestic industry. The chassis is PK9 (the Polish version of K9), and the turret is based on the British BAE Systems M777. It has also been dispatched to Ukraine. Poland uses the AHS Krab + K9PL combination.

How has K9 affected the Turkish defense industry?
The K9 license enabled Turkey to gain modern howitzer manufacturing capability through free technology transfer from Samsung Techwin. MKE’s production infrastructure was established, and BMC later joined. From this foundation, Turkey developed the Fırtına II (ASELSAN FCS, ROKETSAN ammunition) and the Boran 155 export product.

Summary

K9 Thunder is a 155 mm 52 caliber self-propelled howitzer that controls 52% of the modern howitzer export market, produced by Hanwha Aerospace. 10 countries, over 1,900 units, with a 5-year order backlog — a success story for the Korean defense industry. The K9 holds special significance for Turkey: the production of the T-155 Fırtına, which began with a 2001 license agreement, became the foundation of Turkey’s modern artillery capability. Production initiated with MKE led to the development of indigenous fire control and long-range ammunition with ASELSAN and ROKETSAN, extending to a fully independent Turkish export product with Boran 155. The combat experience of the T-155 Fırtına in the Victory of Karabakh is a strong card in Turkey’s export market.

Related News

Sources

• K9 Thunder — Wikipedia (en.wikipedia.org/wiki/K9_Thunder)
• Hanwha Aerospace official corporate page (hanwha.com/companies/hanwha-aerospace)
• National Defense Magazine — South Korea Leverages Industrial Might to Make Arms Market Inroads
• KED Global — Hanwha Aerospace nears $276M K9 howitzer deal with Vietnam (2025)
• Seoul Economic Daily — Korea’s Defense Exports Hit $15.4B in 2025
• Asia Pacific Defence Reporter — South Korea beefs up European defence exports
• SIPRI 2024 arms manufacturers report

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